Someone who regularly has sex with lots of different people and finds it easy to get laid.
Hey, you don't wanna go out with that guy/girl -- I hear they are a real shag artist; they'll probably cheat on you!
During sex the man finishes as quickly as humanly possible, pulls his trousers up, pats the girl twice on the forehead in a patronising manor and leaves
Alright lads, if anyone pulls tonight they have to "power shag"
When the girl/guy someone has been getting close with sexually/intimately is put on a pedestal and looks better than they actually appear to that person
Guy 1: I dunno mate, Jessica has huge titties, a big ass and she's so hot!!
Guy 2: Ahh, that just sounds like you got Shag Vision, man. I wouldn't mind her but I wouldn't go out of my way
Basically telling someone to fuck off and fuck a donkey.
“Hey mate.” says Jeff
“Yeah what’s up cunt?”
“Shag a donkey bahhhhh, don’t use that language around me you dumb cunt!”
Having sexual relations with someone to gain access to a computer system or network.
I got into the network by war shagging the girl next door.
I got her WEP key off her router while she was showering after I shagged her
A DUMB THICCCCC DEER AND I MEAN IT MAKES YOU GO "DAMN THATS A SHAG MCNASTY"
SO INTHE WOOD YESTERDAY WE SEEN A 4. BUT IN THE WAS THAT GOT DAMN SHAG MCNASTY.
To engage in the activity of sex, not to enjoy it but to use said activity as a weapon to piss off your ex or to gain from it or to use tactics to gain sex from someone who would not normally have sex with you because it's morally wrong.
That's clearly just tactical shagging!