Top Definition
Significantly Younger Being. Another term for LG's
Check out those SYBs yo! They're smokin!
by kitkatnutellafiend February 14, 2012
1 more definition
abbreviation for suck your balls. Alternative: SMB, suck my balls.

Person 1: You totally suck at life
Person 2: SYB
by Dopico July 14, 2010

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