Used to acknowledge the start of an erection.
Other word forms - froinker
(hot girl walks by)
Friend 1: Froink!
Friend 2: Dude, don't tell me that shit...

(pause)

Friend 2: ...froink...
by J to the Double L O May 28, 2006
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Janice: Hey are you coming out with us tonight?

You: Haha, no froink you Janice!

Janice: Okay! See you later.

You: Ha, no you won’t froink you Janice!!
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