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2.
Same thing as "you know what I mean" made popular by Bay Area rapper Keak da Sneak
Cutty #1- Man that rip gave some vicious dome, yaddaddamean?
Cutty #2- Who you tellin, she had me bustin in 30 seconds!
by Kenny Peters February 07, 2007
 
1.
It means do you know what I'm sayin? or Do you understand me?
It's part of the Bay Area lingo. Part of the Hyphy movement.
GUY 1-That shorty's got a fat ass, yaddaddamean?
GUY 2-Yeah I hear ya, I know what your sayin.
by Big Willie A.K.A. Payaso March 25, 2006