Any three; the 3d, 3c, 3s, or the 3h.
EXAMPLE: "I had a pair threes before the flop and made trips when a crab came up on the flop."
APPLIES TO: Online and Land-based Venues
RELATED TERMS: King Crab
A pair of threes, especially as pocket cards.
EXAMPLE: "I folded my crabs. I usually play pocket pairs, but I was under the gun with some maniacs at the table and didn't think I could call a raise."
RELATED TERMS: Pocket Pair