1) Preposition; Above and touching a
surface.
2) Adverb;
Working, conducting their intended task.
3)
Prefix; Continuously, continuing.
4) Slang Verb; To be menstruating.
1) I was on your mother all night.
2) Your
computer is currently on.
3) The project is ongoing.
4)
WOMAN: "I'm on at the minute.
Fucking men, they're all bastards..."