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You say when you think someone is not good looking or hot. Often used in situations where one does not want to have sex because the person is ugly. To make one run away and cry
1. One says Hey. You then reply with 'Not Hot' to make this person feel down and emo.

2. A couple are about to have sex. The male/female then says Not Hot to suggest they do not want to engage in erotic activities.
by WillTurnerMan November 02, 2009
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