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1.
An Acronym created by Jesse Boland that means "See You In a Bit"
Brian: Yo Jesse - Im goin to da mall now, you gonna come?

Jesse: Yeah I just got 1 thing to do first. "Syiab" man.
by ThatDudeFromPetroDayzZZZ April 26, 2009
 
2.
Acronym for
see you in a bit
Jake: ill be there soon
Jordan: ok SYIAB
by W9k August 10, 2010