STDU

It stands for shut the duck up. A clean version of the well known STFU which means shut the fuck up.
"STDU, Cate! I don't care about your bunions
by Moochieface7 July 01, 2019
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STDU

Suitable replacement for STFU. It actually means 'Shut the Duck Up'.
Guy 1: Look, DUCKS!
Guy 2: STDU!
by Simon Callahan January 18, 2004
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