An acronym for fuck him/her instantly. Usually used in reference to a celebrity or really hot person. Can be used as a verb, noun, or adjective.
1. Ryan Renyolds? Yeah. He's an FHI.

2. Natalie Portman is such a babe i'd totally FHI.

3. Yeah, He's cute, but he's not FHI cute.
by Rasaa January 08, 2012
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