I'm tellin' ya

i'm completely serious and/or quite positive of what i've just said.

"hey, that guy over there was just checking out your ass."
"yeah, right. come off it."
"i'm tellin' ya..."

I'm tellin' ya by missanthropy February 15, 2006

he's catching on, I'm telling ya 

In reference to Ron Paul's first tv ad for the Republican New Hampshire Primaries.

When this comment is spoken/written, it is meant to be funny.

(As seen in online message boards) Did you see that Ron Paul has 60,000 members in meetup groups? He's catching on, I'm telling ya.

he's catching on, I'm telling ya by Angel Messenger November 25, 2007