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1.
I agree, trying to get a point accross, is unsure but tries to confide in you by using this phrase.

Agreeing when not even on subject, see example.
Usually heard before or after an elongated "breathing through the teeth" sounnd *See thhhhssshhssst, not unlike when a tradesman is about to tell you how much a repair is going to cost you.

Person 1 (saying phrase): Were you watching the game last night?
Person 2: Yeah that save was amazing the keeper made?
Person 1: Thats what i'm sayin'thhhhssshhssst.

Person 2: No you never you just asked if i seen the game?
by urban spotter July 09, 2009

Words related to Thats what i'm sayin'

agree concur confide thhhhssshhssst unsure
 
2.
When someone says something you agree with, don't just say "yeah" or "i agree" go all out and say "THAT'S WHAT I'M SAYIN' BRO!"
Phil:"Yo dude, Packers are probably going to win the 2010-2010 Super Bowl."
Don:"THAT'S WHAT I'M SAYIN'!"
by Call_Me_T R U T H January 18, 2011