Top Definition
a describing word for a guy/girl you would fornicate with, without any hesitation. One glance, fuck me. That simple. Can also be used as exclamation.

Instafuck can NOT be used as a verb (See Instafucker).
A: Did you see Justin Timberlake in The Social Network?
B: Hell yeah, instafuck!

*hot girl walks by*
by ED3ers March 01, 2011
a term used for good smelling cologne that makes girls want to fuck the guy instantly
Matt's instafuck was so orgasmic that i wanted to fuck him the second i smelled him.
by sadie paradise January 04, 2008

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