A pubstomper is a name for someone who usually goes in alone or with a group of people to a public server on a game and complete trashes them.
It often originates from games like Dota and Team Fortress where there is large variety in people's skill levels, some being amazing and some being downright awful.
Pubstomper: Hey man wanna go pubstomp some nubs?
Pubstomper 2: Sure!
Nubs: ermahgerd u faegit imma report u 2 gaben he wil ban u 4 lyfe u hakr!!!!111
The point-- after sleeping with a full shaved woman for the first time-- that one is disgusted by women with any pubes. Taken from the phrase "crossing the rubicon" meaning a point of no return.
After crossing the pubicon with Sarah, sleeping with Debbiemade me feel like I was banging Peter Gallagher's eye socket.