someone very skilled or proficient
John was a crackerjack of a mechanic: he could make a Mustang hum going in reverse.
by Jon64Bailey January 11, 2008

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testicles
as in "im of upstairs to whack my crackerjacks"
by Joe Rodgers (cotk) May 08, 2003

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Someone who is a crackerjack, is someone who is greatly humourous, and is able to "crack" you up, i.e, induce a great amount of laughter from you.
Adam: So then I said, that's not a chevy, it's a fjord!

Gary: You're a real crackerjack, Adam.
by Mister Schmidt May 23, 2010

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A name the Marines use to refer to the Navy or Navy uniforms.
Me: He wears ACUs, right? Guys in those are hot.

Marine Brother: Hes a god damned crackerjack, sis.

They wear those little sailor suits.

Me: D: DO NOT WANT.
by MetaKittie January 03, 2010

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a term used for jacking crackers.
"I just opened a box of cracker jacks and all i got was this bullshit fannypack."

"last night i went to the ballgame and I had me a 3 boxes of cracker jack, nigga you should have seen it. I got like 4 cell phones, a passport, and some paper. And from this one box i even got that bitches phone number"
by G E April 28, 2008

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A moron. An idiot. A clown.
There goes a crackerjack if I ever seen one!
by Ghost July 27, 2003

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Someone who intrudes an organized setting.

Often used in Xbox Live.

Originated In NJ
On Xbox 360:

Me: I got your back.
Friend:OK im going.
Me: The target is there!
Random Person: Hey Guys Can I Join??
Me: CRACKERJACK!
by bgon April 19, 2009

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A game where several men gather around a cracker (I always picture a stoned wheat thin) and furiously masturbate onto it. Whoever ejaculates first wins. By a similar token, the loser is he who ejaculates last. The loser must consume the cracker as a penalty for sloth.
I got the clap from losing a game of cracker jack in college.
by Casey R. June 03, 2005

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