When it's been an extremely long time since intercourse and the resultant build-up produces a discharge resembling a fire hose connected to a vat of sour cream.
Obadiah : It's been eleven years since I had sex with a live woman, and last night I had a butterblast that blew a hooker out a window. I got laid AND I didn't have to pay.
Dude 1: There are a couple hundred peaceful protestors walking up Pennsylvania Ave. Where’s bunkerboy? He should see and hear this.
Dude 2: He ran to the basement - he wants to spend some alone time with his twitter feed.