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1.
When something happens that you didn't plan on initially happening. Usually dealing with romantic relations.
"I told James that I didn't want to have sex but it wasn't until after wards that I realized we got caught up in the heat of the moment."
by Coolaaron88 September 28, 2008
 
2.
N. The number one most used excuse for cheating, and/or unprotected sex.
Guy: How could you cheat on me with that dude at the party?
Girl: Well I got caught up in the heat of the moment and...

Dad: Why didnt you use a condom, now she's pregant!
Son: we got caught up in the heat of the moment...
by Young Enigma January 02, 2010