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3.
Phrase used to denote strong agreement with something said. Varient of the older, more boring "I'll say."
Matt: "Wow, that math test was really difficult!"
John: "I'm sayin'!"
by The Bass Ninja February 01, 2011
 
1.
to agree, to start a sentence, etc
Dustin: Damn, that girls got a nice ass on her
Holda: I'm sayin...
Dustin: yea mother fucker
by Aholda January 22, 2005
 
2.
to be in total agreement with the statement that was said.
Man that girls has a crazy big old butt!

I'm sayin!
by Baby Kitty February 26, 2006
 
4.
Shortened version of "you know what I'm sayin'?".
-i'm so ready to smoke a blunt now.

-I'm sayin'.
by SMALLSBITCHIN December 24, 2010