When two people are together and things start "heating up," whether it be holding hands, making out, fooling around or having sex.
Usually used in a positive manner, but can also be used to make fun of people about an embarrassing hook up.
A synonym for "hook up".
Also called heating up.
Also used to describe ridiculous over-the-top dance moves between two people.
"Adrianne and Aaron were definitely heating up last night, I'm texting her immediately to find out what happened."
"That skank will heat up every hockey player in sight."
(After watching someone make out on the dance floor) "Hey heat up, let's go, the cab is here."