" anybody feels that is nugget of information should be added to the Limerick article, they can add it in two seconds. Merge notices are for situations when two long and complex articles need to be merged. Here it is a quick decision. Go for it. 
Dictionary it, or delete it?  
Merge notices are for where an editor has suggested a merge, no more and no less.  Moreover, you appear to have a broken sense of direction.  The notice is a {{mergefrom}} not a {{mergeto}}.  Both articles discuss the city of Limerick.  We don't have duplicate articles about the same thing here.  However, the reason that I suggested the merge, rather than outright did it, is that clearly the claim that Limerick is known as ""Stab City"" for the reasons stated needs to be checked.  The article, like so many such articles, doesn't cite any sources.  With the notice, other editors will come to the discussion, and perhaps they may attempt to verify the article to be merged and say ""That's a load of old baloney!  Limerick isn't known as Stab City at all."" and instead decide that rather than a merger, an outright deletion of Stab City for being unverifiable is called for.  Or, on the other hand, they may come up with some sources to cite.  Either way achieves a better result than just doing the merger.  
The merge notice is not intended to draw attention to stubs needing work. You could have posted a note on this talk page. Limerick is known as 'Stab City' (or used to be a few years ago anyway) but it is derogatory. There are seperate articles for city nicknames - see Big Apple. Googling '""Stab City"" -Limerick' turns up 1000 sites, including a US band. So Stab City could be perhaps a disambig.  
It wasn't a stub needing work.  It was, and is, a duplicate article, plain and simple.  Both articles are about the city.  I've pointed this out several times, now.  I've also pointed out that the parallel with Big Apple is a clearly false one.  
You haven't explained why it is 'clearly' false. The Big Apple is a nickname for New York and contains the history of the usage of that name. ""Stab City"" is a nickname infrequently used to refer to Limerick in a derogatory way. The ""Stab City"" article has almost no content, but could be expanded to be a history of the usage of the name. I don't have the time or interest to do this.  Another example is Big Easy which redirects to New Orleans, or City of Light which redirects to Paris. If City of Light was an article containing one sentence: ""City of Light usually refers to Paris."" would you put a merge note on Paris too?  
If it were as superficially bogus as ""stab city"" was: Yes, of course.  This process is known as ""asking for the opinions of other editors"".  It is a useful tool in some circumstances.  Notice that it works.  Two editors have already given different opinions here, and a third is forming an opinion.   
It is possible to ask without adding a merge notice. As you seem to agree that the article is potentially bogus, and that we are now having a discussion about it, I have removed the merge notice.  
I've restored it.  The notice is there not just to get your attention alone, and I wrote ""as superficially bogus as 'stab city' was"".  
Uncle G, How would you like to progress with this dispute?  
Uncle G has not replied for 5 days. I have added a one line of text to the article and have removed the merge notice.  
 The Stab City article is inaccurate in any case - the nickname dates back to well before the late 1990s and first arose after an incident in which an Argentinean tourist was stabbed.  I think this was in the mid 1980s.  I haven't edited the Stab City article as I'm undecided as to whether it's worth having.  
Merge it now - stab city is unfortunately associated with Limerick but it being regrettable is not an excuse to suppress it, but it certainly does not need a separate article.
 I agree, merge it now. I can't see a realistic prospect for Stab City to become a full article. I think there's a case for a Crime in Limerick article, but not for one on this piece