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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
 
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
 
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