: 
 :This is a disambiguation page. Basically, people end up here when what they looked for wasn't specific enough. The page currently gives info on existing wikipedia pages that people might have been looking for, and a link to a general definition of the term. 
 :The general definition covers #1. 
 :The company in #2 doesn't seem to have an article. 
 :I am unfamiliar with the usage you suggest in #3, though it's possibly a correuption of the use of the term by lesbians to refer to cunnilingus ("lip" referring to labia). 
 :I don't see anything missing from the disamb page. -