1 definition 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.

by mxxx July 11, 2008