Saying originating from Belmont County, OH. Used to begin a story or after something that promotes bragging rights in a rural or backwoods boondocks area. A similar saying is That's what's up.
Ex. I put a 3" lift kit and some 31's on my Chevy Tracker the other day, I'll tell you what and such.

Ex. I caught a catfish the other night. It was a big'un, I'll tell you what and such.
by ovredneck69 June 22, 2014
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By the use of this phrase to open or close a statement, the user acquires or asserts a pleasant, folksy authority. Sometimes paired with "boy" for added authority and folksiness (see example).

Frequent famous users include Cris Collinsworth and Hank Hill.
"Boy, that was a heck of a down field block by Michael Vick, I tell you what."

"I tell you what, the Seattle Seahawks came here to play tonight."
by TebowTime23 January 20, 2012
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1. A response to something so stupid or unbelievably retarded that expresses total confusion as to why it was done.
Gabe: "hey the Dolphins game is in overtime"

Danny: "oh for real? who's winning?"

Gabe: "YOU MEAN TO TELL ME?!!!"
by umean2tellme January 4, 2004
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a smart assed response used when someone has asked 'wat the hell?'. of course this is followed by wat is actually the hell.
i.e. Gabby walks in on her sister running about her room like a mad woman.

Gabby: Gwenn, wat the hell?!?!? you look like a retard!

Gwenn: the hell? you want the hell??? i'll tell you the hell. i just ate a bucket of sugar with a shovel!

Gabby: *sigh*
by Xx moonlight xX February 16, 2011
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I don't know what you are doing, but I can tell you are doing it wrong.

This is a humorous way to point out bad problem solving methods.
I don't know what you are doing, but I can tell you are doing it wrong!
by I, Wreckerrr December 12, 2020
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When you feel the need to make someone feel dumb by demonstrating your knowledge over a wide variety of subjects, this phrase is useful.
Me: That's not true
Moron: Yes it is.
Me: Let me tell you something... (infinite pause)
Moron: ... ?
by mikeschneider May 15, 2006
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I don't know what you are doing, but I can tell you are doing it wrong.

This is a humorous way to point out bad problem solving methods.
I don't know what you are doing, but I can tell you are doing it wrong!
by I, Wreckerrr December 12, 2020
Get the I can tell you are doing it mug.