The act of getting a wank but instead of it being with somebody's hand, its off a pussy. In other words sexual intercourse.
Can be also used to describe a person or just a thing you can say whenever you feel like it
I'm horny as fuckscan, I'd fucking love a pussywank.
Ah fuck lad, thats a pussywank
A pussywhacker is someone who often has sex with multiple women in small amouts of time. As do most rappers and other celeberties. You could also call this
person a man whore.