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2.
They mean to say know what I am saying?
Slang: Nome saying fool

American English: Did you understand what I am saying.

Queens English: I say, Do you understand what I have spoken to you?
by Tubugs February 12, 2012
 
1.
short form of "You know what I'm sayin'?" Used during conversation to monitor the participants comprehension of each other.
Aw, hell naw. I stay wit my aunt up on 48th and Rome, nomesayin?
by CJ January 25, 2004