Adjective
The
person/thing at the top of their/its game (the best of the best).
Everything else is measured against the fuckin'.
Comes from the
key part of the sentence when describing
awesome things "It's (the fuckin') best!"
Synonyms: G.O.A.T etc.
"O.M.G! How good was that?!"
"Yeah, it was the fuckin'!"