Get Up In , when seeing one of your friends creepin on a person you yell it as a code word as to not let the person whos getting creeped on know that you just told you friend to have sex with that person
at the bar or at school "dam josh is really creepin on that chick, G.U.I. bro!! "
The act of drinking a large amount of alcohol, and gobbling like a turkey.
Jim drank a whole bottle of Dack Janiels and gobbled loudly and waddled around like a turkey for well over ten minutes. Then soon after, a police officer tasered him, cuffed him, and took him into custody. He's going to do six months community service for his G.U.I. That poor bastard.
A Graphical User Interface. The addition of GUI's to most modern operating systems has revolutionised the populous' ability access pornographic material, and contributed greatly to the happiness of the single geek/male population.
Oh dude, this pussy looks so hot in HD, thanks to my GUI!