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Military origin: To do hard work or exercise.

Interpretation: During strenuous activity, the body temperature will increase.
Moving equipment from point A to point B, sergeant yelling: "We don't have all day, get hot! Get hot!"

Doing morning PT: "Move your asses! Come on! Let's go! Get hot!"
Get hot by Rakor September 5, 2012
"You guys haven't started the project yet? Better get hot, biotches!"
get hot by Carl Willis October 17, 2004
To get angry and about to hit somebody.
Nigga was gettin' hot, he was bout to steal on that bitch
get hot by PerfectBalance February 5, 2005
The act of getting hot on an object or person; not to be confused with 'getting wet'.
Crutches tried to get hot on the stairs, but the stairs got hot on him.
Get Hot by crutches&steph September 2, 2017

Don't get hot! 

This phrase is commonly used to tell someone to settle down before they become overly angry or upset. Italians tend to use this phrase more often than other nationalities.
Amanda: I skipped class today and I just realized I might have missed a test!

Anthony: Don't get hot!

Amanda: Ok.
Don't get hot! by strawberryamanda September 22, 2008

To get hot by a car 

To have sexual intercourse with a car
"That guy loves to get hot by a car"