Definitions by mxxx

CrackJack 

(Crr-Ack-Ja-Aack)
Noun.
Refers to someone rediculously immature,stupid,or just plain out retarted.

Dude we went to chruch with my girlfriend and my brother was acting like a total "crackJack",I was totally ruined.

CrackJack by mxxx August 5, 2008