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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
 
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