A portmanteau of fiend and grin. It's usually used when something sinister comes into mind.
Person1- "That guy is always up to something. Why is he ginning so evilly?"

Person2 - "It's a frin, a very sinister frin"
by Caudillo August 06, 2011
A group of faggots on a forum that combined their powers for the love of the forum.
Wow what at that group of frins.
by Hahano1 September 12, 2011

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