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1.
When something or someone is liked then disliked, or alternating frequently on status of opinion.
damn, she treat me so hot n cold.
by Frat house BEA November 09, 2008
 
2.
one of the greatest songs ever!!! sung by Katy Perry

with funny music video to accompany it!
Girl: I'm so happy
Boy: why?
Girl: I'm listening to Hot n Cold :D
by IrishGirl101 January 22, 2009