Diddy Told UCLA Coach ... 'I'm Gonna F**k You Up'

Diddy's alleged terrorist threat involved a bomb ... an f-bomb ... with sources telling TMZ Sports the rap mogul threatened to "f**k up" the UCLA strength coach during their office fight.
Law enforcement sources tell us ... after Diddy swung a kettlebell at strength and conditioning coach Sal Alosi, he allegedly screamed out that he was "going to f**k him up."