Top Definition
Scupper: (noun) The plumbing drain cover of a floor drain or the deck drain of a boat/ship thats used to drain everything from mop water, through fishing guts down to raw sewage drainage out in the open sea.

To call someone a "scupperlip" is a naval term to say that someone talks a lot of shit
"Seaman Nelson sure talks a lot of scupperlip"
by Trailltrader August 16, 2011

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