When a male becomes fully erect without anyone touching his Penis. It can become erect from one's thoughts, possible a female sitting in one's lap, or maybe even a bumpy car ride.
I was sitting in math class and all of sudden i got froined up...it was awesome
by froinmaster October 24, 2011
To rock the shit out of an afro.
Guy 1: "Yo, you peep this peazy motherfucker over there in the corner?"

Guy 2: "S'ait dawg, he jus' froin'..."
by bootylove December 17, 2010
Referring to an afro-like/poofin' style of hair, preferrably jewish afros/texture of hair.
Rachel's hair is totally fro'in.
by Rachel February 17, 2005

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