To make hairy or shaggy; to roughen.
To hang in shaggy clusters.
To shake, wiggle around.
To have sexual intercourse with.
To have sexual intercourse.
To masturbate.
To chase after; especially, to chase after and return (a ball) hit usually out of play.
To perform the dance called the shag.
An act (or acts) of sexual intercourse.
Used to express dislike of or annoyance towards the thing mentioned.
I'm sick of this shagging job.