Definitions for "Trey"
Three, at cards, dice, or dominoes; a card, die, or domino of three spots or pips.
three-spot.
Threes are sometimes called treys. So 33377 can be called treys full of sevens.
Australian pre-decimal threepence.
the cardinal number that is the sum of one and one and one
In roulette, an outside wager on whether the next spin will be a red or a black number. This bet is played off at even money.
Specific quantity of Marijuana
A 3-point basket.