The combination of "that will." I shortened it.

If she goes for it, that'll be sweet.

That'll be awesome if you win.
by Mark Gjetaj October 6, 2007
An expression meaning "That'll never happen". Shortened from "That'll be the day when (insert ubsurd impossible occurence here, such as 'Pigs will fly')"
Bob: I'm gonna kick your butt!
Joe: Haha, yeah, that'll be the day....
by lovehorses94 May 13, 2008
A slang term usually uttered by rednecks that literally means " That will teach him", or "that should teach him a lesson". Its a contraction of the grammatically incorrect phrase "that will learn him".
Somebody at work keeps stealing my lunch, so today i brought in a bowl of spit-snot-soup. That'll learn'em to take things that don't belong to him.
by Mingus Jenkins March 12, 2011
A statement to indicate that a given action will lead to a successful outcome, or just that the action holds promise.
In a golf game, the golfer makes a good shot and the commentator says "that'll play".
by jeffie123123 March 30, 2010
Something said in response to a quote or phrase when a sermon or a lecture can easily be made from it and it be accurate to scripture or text. Usually said in church when someone agrees with something the preacher says.
Man 1: "True humility is not thinking less of yourself; it is thinking of yourself less."

Man 2: "Amen! That'll preach!"
by Archer Thornwood. July 6, 2018
A phrase that is said in response to literally anything.
"OMG my dad died!"
"Oop, that'll getcha, that'll getcha real good!"
by dallasansel April 27, 2018
Sarcastic phrase the receiver of a threat says when someone threatens to do something whereby their threats are deemed to be better off for the receiver of the threat.
Muslims: We muslims will boycott Europe if you do not comply with Sharia law!

Receiver: Yeah, that'll show them!

Woman: We will strip naked to protest the patriarchy!

Men: Yeah that'll show them!
by Jeronleow April 23, 2018