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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
 
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