In case you're serious or anybody else was wondering:

2015:

* "Vater rolle": "father roll" (same pun as in English: "father role" would be "Vaterrolle" (no space))

* "Such das Kölsch": "Find the Kölsch"

* "Dosiert feiern": "Dosed partying" ("Dose" also means "can")

2014:

* "Da haben wir die Bescherung": "There we have the mess" ("Bescherung" literally means the handing out of presents on Christmas)

* "Vom Weltmeister empfohlen": "Recommended by the (football) world champion"

* "Früh Sport mit Poldi": "Früh Sport with Poldi" (Poldi refers to football player Lukas Podolksi, "Früh Sport" could also be read as "Frühsport", which means "morning workout")

* "Ist ja schließlich nicht Muttertag": "After all it's not Mother's Day." (a lot of father's day customs involve getting drunk)

* "Karneval nicht irgendwas aufreißen": "Not tearing up just anything on Karneval" ("Karneval" refers to Rhineland carnival, "tear something/someone up" also has the same notations of "picking someone up" -- i.e. finding a date or getting lucky)

* "So hätte jeder gehandelt": "Everyone would have done it this way"

2013:

* "Fließend Kölsch": "Fluent/Running Kölsch" ("fließend" here is a pun as it can either refer to the beer pouring from a tap or fluency in the Cologne dialect also called Kölsch)

* "Das gelbe vom Ei": "The yellow of the egg" (common phrase meaning "the best part of something")

* "... Mutters Tag": "... mother's day" ("Mother's Day" is called Muttertag in German, so this is meant to be read literally)

* "Vaters Tag ...": "Father's day ..." (same deal as above)

* "Leider geil!": "Unfortunately horny/awesome!" (meaning something to the effect of "I'm afraid to say this is totally awesome", hook-line of a popular German rap song that was getting a lot of radio play time at the time)

* "Wechselwähler": "Swing voter"

* "Heilige Drei Könige": "Holy Three Kings" (referring to the Three Wise Men / Kings of the East in the Christmas story; Cologne Cathedral has a shrine that allegedly carries the remnants of the Three Wise Men)

2012:

* "Alles andere ist Fasching": "Everything else is carnival" ("Fasching" is a term for German carnival used in various German-speaking regions other than the Rhineland; in the Rhineland it is called "Karneval")

* "Kleinste Theke der Welt": "Smallest bar in the world" (Düsseldorf has a downtown area that is often called "Längste Theke der Welt", i.e. "largest bar in the world"; Düsseldorf and Cologne have a long-standing (today mostly humorous) rivalry)

* "Es löwt weiter": "It's carrying on" (the correct phrase would have been "Es läuft weiter", "löwt" sounds similar enough but is a reference to Jogi Löw, the trainer of the German national football team)

* "Wir sind mit dem Radler da": "We are here with the Radler" ("Radler" is a popular shandy consisting of lemonade and beer; it's likely derived from "Fahrrad", meaning "bicycle": a "Radler" is someone who "radelt", i.e. someone who uses a bike)

* "Gefällt mir": "Like" (literally "I like this"; this is what the Facebook "Like" button reads in Germany)

* "Heilig am Abend": "Holy in the evening" (a play on "Heilig Abend": "holy night", the night before Christmas)

I'm not going to do the rest, though ;)