(slang) To start a fight (sometimes with on).
Watch out or Brody'll lay the smack down.
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(slang) To decisively defeat or dominate (sometimes with on).
Did you see her lay the smack down on the bouncer?
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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.
See all Regional & Other slang on Slangora.