interjection, noun, noun or participle which takes 'suru', intransitive verb
Vulgar and colloquial; used as an interjection, noun, or intransitive verb (often with する). Carries the same strong offensive force as in English.
ファック！またやっちゃった。
Fuck! I messed up again.
That movie has too many fuck scenes.
彼らは酔っ払ってファックしてた。
They were drunk and fucking.