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1.
IGAB started when two friends were talking online and abbriviating everything. IGAB stands for I Got A Boner.
dude, i was sitting here, and that girl walked by and IGAB.
by CWBWBN April 02, 2006
 
2.
Started by two friends talking about boys. It means in giggles and butterflies.
I'm so igab with this guy.
by meadowkiss October 21, 2010