SYB means steal your bitch, the is basically steal someones girl. when a girl has a man and you want you or when you talkin shit to another dude
by bottylusions December 7, 2016
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Instagram post: “Gonna be the best year! #SYB”
by amelmck September 7, 2018
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SYB is an acronym for Shave Your Bush (bush meaning pubic hair on a girls vagina.
Owen: hey i heard you need SYB abi from Jamie.
Abi: hush i shaved last week!
by EuenT October 28, 2018
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abbreviation for suck your balls. Alternative: SMB, suck my balls.

Comeback.
Person 1: You totally suck at life
Person 2: SYB
by Dopico July 15, 2010
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An acronym for "See You Bye" which is another phrase for goodbye.

Used at the end of a message to let someone know you're leaving
by possum pocket January 8, 2017
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Significantly Younger Being. Another term for LG's
Check out those SYBs yo! They're smokin!
by kitkatnutellafiend February 15, 2012
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Anyone can drop a normal mock on someone like "you're ugly" or "you're stupid" but it takes a special someone to drop a dirty syb mock involving sybians, butt juice, vag juice and big round black sybian heads.

Any shit talk that involves sybian machines can be classified as a syb mock.
You enjoy sitting your fat ass on that nasty twin headed sybian dcarl WUWU WUWU. Drop that syb mock on your friends and see what they say.
by zoneseek October 4, 2006
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