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1.
A slang or an abusive word for Berlin, the capital city of Germany. The source of the slang is unclear. There are two possible versions it:
1) A cut from the name of the country, that is, GERmany.
2) From the adjective "Girly", that means- the city is either girly, or has some nice girls.
"I was in Gerlin a few months ago. You know, I gotta admit, that is a kinda nice city!"

"In 1989, after the fall of the Berlin wall, West Berlin and East Berlin reunited into the city of Gerlin."
by Urban_Fellow May 28, 2006
 
2.
The leftover trash that you have sitting around the house after a horrible party.
Eeww I just stepped in that gerlins!
by ymnop[u0sd6t7ghp;asdiyrtwvb February 08, 2011
 
3.
A person you don't know whether to be disgusted by, or fuck the shit out of them.
Girl 1: That guy is such a gerlins
Girl 2: I know right, he is such a perv!
Girl 1: No, I WANNA HUMP THE SHIT OUT OF HIM
by fudwbdlaulb February 12, 2012