Top Definition
1-(a) A person who thinks he is "all that" but actually is just a joker in a box
-(b) A person who sucks at life
-(c) A failure

2- The card found inside a deck
Person 1: I'm a beast at CoD, dawg
Person 2: Absolutely not, you're just a jokerbox.
Person 1: Yo I just got a 50 on my math test.
Person 2: Dude you're the biggest jokerbox EVER.
Person 1: Kid did you see that jokerbox over there?
Person 2: No, what did he do?
Person 1: He sucked.

Person 1: You got any jokerboxes in that deck?
Person 2: Naw man I lost it.
by June 20, 2010
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