Definition of def in English:

def

adjective

informal
  • Excellent.

    ‘a truly def tattoo’
    • ‘I had to admit that ‘Fight for Your Right ‘was pretty def and all, but c'mon, this wasn't serious music.’
    excellent, wonderful, marvellous, magnificent, superb, splendid, glorious, sublime, lovely, delightful, first-class, first-rate, outstanding
    View synonyms

Origin

1980s: probably an alteration of death (used in Jamaican English as an intensifier), or shortened from definitive or definite.

Pronunciation:

def

/def/