When a female is performing fellatio, and uses her teeth to firmly 'plow' the surface of the erect penile shaft, inducing pain. Can be intentional or unintentional.
He was being a total ungrateful dick, so she showed him with a plowjob he wouldn't soon forget.
When your girlfriend smothers her period blood on your dick and she sucks it off
A Plowjob is when a girl takes out her tampon and drains the blood on your dick and sucks it.