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1.
v. - The act of having anal intercourse with someone who has recently consumed very spicy food. First coined in late 2006, the term "heatwave" refers to the warming sensation on one's penis during and after the act.
"He picked up a couple of hot chicks at Taco Bell and pulled a heatwave on them."

"Extra-spicy pad thai and I heatwaved her something crazy."
von A. Nichols, J. Vose 13. Oktober 2006
 
2.
When a wave/group of hot girls walk your way. A rare, yet pleasureful moment.

Minimum of 5 girls to be considered a heat wave.
Brosef 1: Uh oh bro, heat wave 1 oclock!
Brosef 2: Time for the gun show...
von mtndew789 22. Juli 2011
 
3.
The wave of heat that hits your face when you open the dishwasher.
Guy 1: ''I got hit by a major heat wave last night doing the dishes!''

Guy 2: "I got hit with one this morning."
von aus10rill 10. Juli 2012
 
4.
The act of a male masturbating into a portable heating fan, spraying the warmed ejaculate back upon him.

The winter time equivalent of a 'cool load.'
It was so cold out yesterday, I just stayed in and cranked out a Heat Wave.

Carl's so dumb, he's always busting out a cool load in the winter and a heat wave in the summer!
von Fitz Kirkpatrick 20. Februar 2009
 
5.
When lying in bed and one let's out a smelly and juicy fart, they rid themselves of rancid air by using a blanket to fan the smell towards some other unsuspecting victim. Also known as a Missouri Wind in some places.

See also: Florida Breeze.
I gave my dad a heatwave while he was on the computer. He did not like it much.
von Devin Rodden 25. November 2012
 
6.
The ancient process of removing the contents of a backpack, turning the bag inside out, re-filling it with its contents, then waiting to watch the expression of confusion/disbelief on the bag-owner's face when they see what some loser did to their bag. However, it is thoroughly amusing.

The term was derived by the appearance of a "heatwaved" bag, which looks like a Dominos Pizza delivery bag.

Made famous by the thayer academy class of '07, particularly Artie and Slider.
"Fucking Cock!!! I got heatwaved again and my name is Cathal"
von Arrbear 31. Dezember 2004
 
7.
A well-known DJ from Essex.
There was supposedly only one reason the name was given to him,
It is said that 'Heatwaves' are both Kool and Hott at the same time,
and so the name was happily accepted and therefor he switched from what was his previous name (Dj Trinity).
Hey Sandra, did u get 'Unleash the Heat', Dj Heatwave's new MixTape?
von Heatwave Fan No. 1!!!!!!!!!!! 19. Februar 2009