Gibbies are like hypies. You know.. when you are really, really hyper or excited? I guess the single form of "gibbies" is "gibby." If you got a high score on a video game or something.. and you were kind of expecting it, and you - with out emotion - are like, "YES." ....thats a gibby. But if you HAVE the gibbies usually you have more than one. :) I'VE GOT THE GIBBIES RIGHT NOW!
person 1 - OH SHIT! I can't focus!!!
person 2 - why?
person 1 - CAUSE I'VE GOT FUCKIN' GIBBIES!!!