1: Term given to the actions of a woman who has been defined as a bitch, sexually pleasuring a man's phallus by use of her hands.
Often seen as a derogatory term for women who perform inadequately during said stimulation.
2: Term given to define someone of minor intelligence or who has shown an inability to perform menial tasks.
Often considered vulgar and crass in social situations.
Terry: What happened last night with that girl?
Bob: Oh, her? She was a total bitchwank. I tell you man, never again.
Man: He's acting like such a bitchwank. He's broken five conveyor belts today! I'm going to fire him one of these days.