A word that you hear among friends or in an NSFW program and you don't think googling it will give you the results you want, so you go to Urban Dictionary
Friend: Spent an extra five minutes in the bathroom because of morning wood, stain wouldn't get out of the carpet.
Innocent Friend: Oh, okay.
-looks up on Google-
A monster in Terraria? Must be of Urban Origin.
-looks up on UD-