ass heat 

The residual warmth on a chair or toilet seat from someone else's butt.

I sat down on the throne in stall 2 and I knew that Carl had just been there from all the ass heat.

ass heat by Weepy November 9, 2004

big ass heatsink 

One of the many tools that will make computer geeks orgasm.

computer geek: "Oh damn, that is one big ass heatsink"

big ass heatsink by just some randomass person April 11, 2014