To indicate that someone (normally the speaker) is either masturbating, or inspired to by sexual arousal.
Pornography.
To masturbate.
A session of masturbation.
An expression of surprise or disbelief.
To tell someone to leave or to stop being bothersome.
To leave; to bugger off.
To remove the lid of a jar or other container by unscrewing it.
To fail to do one's work; to goof off.