Dirty Magnus is when a girl is talking to a boy for month and clearly likes him but then magnus carries on sleeping with other girls. The girl would then perform a blowjob on their dog just to get attention from this boy. He would then perform anal on said girl.
Magnus: Ok i’m gonna stick it in
Girl : I’m ready
Magnus : Ooooooooo
Lila : You’re so Dirty Magnus
i mean Girl?