v.intr. sl. 1 (in imper., foll. by off) go away. 2 (as naffing adj.) used as an intensive to express annoyance etc. [prob. euphem. for FUCK: cf. EFF]
NAFF
Meaning of NAFF in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012