To fidget, to wriggle around
Will you sit down and stop frigging around.
To masturbate
She never forgot the day she was caught frigging herself in the library.
To fuck (misapplied euphemism)
Come on honey, let’s frig.
To mess or muck (about, around etc.)
Be sensible, you’re just frigging about now.
To make a temporary alteration to something, to fudge, to manipulate
The system wasn't working but I've frigged the data and it's usable now.
Female masturbation
(minced oath) A minced oath of "fucking" as an intensifier.
Will you get out of the frigging bathroom? We're already running late.
(minced oath) Fucking, as intensifier.
He thinks he can frigging sing.