In gambling slang, 'crabs' refers to rolling a two in craps — specifically a pair of aces, the lowest possible dice roll. It's an automatic loss on the come-out roll and one of the most dreaded results in the game. The term likely comes from the sideways-moving shape of the two dice side by side resembling the legs of a crab. In broader slang, 'crabs' can also refer to pubic lice, but in gambling contexts it specifically means snake eyes or the losing dice result.
He blew on the dice for luck, rolled them hard, and watched his fifty dollars vanish as crabs came up.
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(gambling, slang) A dice roll of two aces.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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