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Taking a butt plug of any shape or size and dipping it in icy/hot before sticking it in someone's ass as a punishment or for torture.
If you keep it up, you'll be getting the heat treatment when we get home.

'Dude, what's wrong with him?'
'Oh, she gave him the heat treatment last night.'
by Joe Stallings June 14, 2008
A term used in BDSM involving icy/hot play around the anus.
Commonly, with a butt plug in the submissive's ass.
If a Master's pet misbehaves, he may have to punisher her with the heat treatment.
by Blue-Moon June 17, 2008