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1.
A person so full of luck in poker that it is disgusting and ridiculous. There is surely some skill involved, but a luckbox will demonstrate more luck mixed in with that skill than any other player.....ever......in the history of the world......even more than Chris Moneymaker, which is just absurd.
Player 1: I just caught a flush on the river to win a 500 dollar pot! The other guy had Aces but I cracked them good!
Player 2: Stfu you luckbox.
by Definately NOT a luckbox July 26, 2004
 
2.
Used to account for one's surprisingly good fortunes or previously unknown talents. A way to rationalize when something happens that far exceeds the known abilities of someone or something.
I thought going into the fantasy football draft this year that it would be a total crapshoot, but I was able to luck box a crenshaw team that is rock chalk to win the championship.
by Dave.R. July 01, 2006
 
3.
What a dumbass poker player, who only plays strong hands and almost systematically all-in, calls a gambler, who sometimes calls with speculative hands and a higher stack, when the latter wins the pot.
NL Omaha 8 tournament, final table, blinds 25-50

Gambler (3000$): 4567 limps in
Tight player (1000$): A99K calls the SB

Flop: A 2 9

Tight player (with a set of nines and no low) shoves 500$

Gambler thinks for a minute and then raises all in (with a good LO draw and two straight draws)
Tight player calls immediately

Board: A 2 9 5 8

Gambler scoops the pot: HI 56789, LO 65421
Tight player writes: "you fucking luckbox"
by Dr Bepi August 31, 2011