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1.
A game where the two players kiss without stopping and without touching each other. If one player touches the other, s/he loses. The winner gets to do whatever s/he wants to the loser.
On The L Word, Shane and Carmen played a steamy game of Too Hot.
by Claire L July 11, 2006
 
2.
When something has too much attention
We can't gamble in the restroom, it's too hot.
by Rey Regall February 20, 2010
 
3.
The resulting message concluded when one runs a radioactive sample through a scintillation counter that exceeds its measuring capabilities. A scintillation counter is a device for detecting and assaying scintillations produced by ionizing radiation.
To her delight, Amy discovered that her radioactive samples were TOO HOT to be assayed by a scintillation counter.
by Tong00 October 28, 2005