Top definition
Shut Yo Ass Up, when someone says something you either
1. dont wanna hear.
2. extremely stupid.
<dude> dude, you suck
<guy> your mother sucks
<dude> SYAU!
by NickBeam January 21, 2008
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2
SYAU is an acronym for Step Your Aim Up. Most commonly used in the Call of Duty community as a way to tell a fellow player their aim sucks, or step their game up.
JAMES: Hey Jake 73 hit markers later and that Christmas noon punched you to death.

Jake: CMON MAN WHO THE HELL DOES THAT? THIS GAME IS TERRIBLE. GODDAMN CHEATERS. GIT GUD SCRUBZ!!

James: SYAU Jake, your bad.
by Xcruciate May 04, 2016
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