1) To be in a conversation where another friend says something that you have no idea of the meaning of, and have to look up afterwards.
2) To be insulted by a person who obsessively looks up new words on Urban Dictionary. Even worse if you have no idea what they're talking about.
1) Jack: I just donkey kicked my bitch last night. Fuckin good!
You: Umm. . Yeah. . .
Jack: You know what I'm talking about, right?
Random passerby: Lol, you just got urban dictionaried!
2) Livy: You such a limp noodle.
You: Uh. . whhaaatt? I'm trying to listen to Fallout Boy here.
Livy: YAG.
You: Huh?
Livy: Gaylord.
You: *phone rings* Oh, I gotta talk to my babe.
Livy: How's slut chops then?
You: *walk off confused*