When a person is acting suspicious, weird or out of the ordinary.
Look at Margret over there sheβs acting booky.
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A shady character that takes illegal bets on horse races, fights, sports games. Such people usually are robbed regularly as they have large amounts of money.
Oh shit, I went to the bookie but then he got pinched! There goes my bet.
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Matt: Oi, fancy getting a bit booky?
Josh: I'm already booky mate
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snakey snitch not to be trusted
See ur cuz he was carryin on wid some booky movements yeasturday. Guess hu he was at the funfair wid?
Nahe bruv dats booky swear down
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