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Generalised acronym for the phrase "Show me your knockers". Vastly used as an abrubt statement when one wishes to discern a marvellous pair of mammary glands.
Douche 1: Hey lad check out them melons.

Douche 2: BRO those tits are NOTSAFE.
Douche 2: Hey babe! SMYK.

Girl: What, they're real - I swear.
by quasi-intelligent July 06, 2016
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