A sign of approval for anything. be it clothes women or an idea or a fantasy. best usage of this phrase in the awesome film eurotrip.
Scotty: mica's a girl
Cooper: he's the girl, your the girl, sometimes your both the girl. that's hot man.
by Jdawgthecool February 22, 2009
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noun, often preceded by "the"

an event, situation, or circumstance that is so unexpected and out of the ordinary that it causes a problem or otherwise uncomfortable environment for which no solution or recourse is readily available or obvious

an event, situation, or circumstance brought about by or made worse by incomprehensible ineptitude
I was hoping for a quiet vacation with my girlfriend, but the hotness found me when I ran into both my wives and my parole officer there.

It was bad enough when the university's e-mail server went down, but they really brought the hotness when the e-mailed everyone telling them that fact.
by nopain00 March 3, 2005
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Hotness = Merith from WoKF. :P

(Sexual attractivness to a certain individual, usually someone with a good looking face and body)
Sarry: Merith, damn you're hot.

or

Your hotness amazes me.
by Merith August 27, 2008
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something that you would scream while sitting in the backseat of someone's car if the air conditioning was not circulating to you.
"It's Hot!"
by 707muthaaa August 28, 2008
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It's simple. A stupid term supposedly made by a stupid bitch. You can use it when you are watching cheerleaders, otherwise, just.. Sh.
A PLUS

Dewd #1: Dude, look at those chicks.
Dewd #2: That's hot..
Dewd #1: Yeah, chicks making out is great.

A NEGATIVE

Dewd #1: Omfgz, l00k at th1s shirt I bought at fl1ppin amerkin eagle.
Dewd #2: That's hot.
Dewd #1: OMGFZ, you're hot.
Dewd #2: That's hot.
by .mmmhm. June 11, 2005
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paris hilton can use that's hot for generations to come even if the phrase was not invented by her, she has made it a trend for many years to come.
i love that shirt paris hilton wore!
i know, THAT'S HOTT!
by loopyfun1 June 8, 2005
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The phrase used by Paris Hilton to describe global warming. Paris is going to stop playing the dumb blonde and watch "The inconvienent truth" on dvd and then have a serious talk with her father to meet with Al Gore to make sure the Hilton Holtes have a major part in saving our world. This will redeem her unsavory past and give her some substance. NOW THAT'S COOL!
"That's hot, and it's getting hotter"

Don't wait, to take action, this is not the diet that you will start tomorrow, we have to act NOW !

Our future depends on it...
by Mimiig68 November 25, 2006
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