15
Abbreviation of the saying “oi fuckhead no” meaning think before you speak.
Prior to shooting my mouth off without thought, I should think OFN.

OR
In order to stop myself from saying something I’ll regret, I should think OFN.
by Justthisforabit August 22, 2020
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16
ofn is short for oh fuck no
jimmy says to beth "let's have hard anal sex" and beth says back to jimmy "oh fuck no aka ofn"
via giphy
by slimjimjohn May 25, 2020
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