The powerful and exclusive attraction to fucking the shit out of another person in which there is no desire for long term commitment, romance, or 'being in love'. Nevertheless, the passion and desire of a typical crush is fully present in a fush.
(Katie leans over at the hips to the desk on her left as she talks to a friend)

Jonathan: I must devour that.

Larry: ya but don't you want to fuck 70% of the girls in our grade anyway?

Jonathan: Those round, supple, meaty cheecks are apparent to any and all with sight, so it must be blindness that has caused you to not see the difference between Katie's ass and all other girl's asses.

Larry: Dude, Katie's ass has got you fushing on her hard.
by Shoogooboogoo June 27, 2012
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Emma: Omg I hate him so much! He's such a dick.
Katie: I know right, he's a total FUSH
Emma: You're totally right.
by fushyouup February 10, 2017
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Fushling, Fush Face.
Feline with Tri coloured or classical wings as in Feline from Heaven. (Sign of good luck)
by Ali June 24, 2003
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