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When someone is particularly attractive. Derived from the popular Kings of Leon song "Sex on Fire".
Damn, her sex is on fire.
by caibzlin7Q February 25, 2009
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Like the icing on the cake, something happens to improve something else massively

see also sex is not on fire
-At this party tonight... remember I said Ben wasn't going?
-Well now he is
-Sex Is On FIRE!!!
by Sharn October 27, 2008
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