This is the logical conclusion of any proper "space docking." During the armageddon, the asstronaut craps in a woman's vagina. Following this brave act, he proceeds with vaginal intercourse. This is reminicent of splitting the asteroid in the hit movie of the same name.
Chachi knew that Jen was DTF. He didn't know for sure, but he was pretty sure he could get away with armageddon if he got her drunk enough.
A bar shot that is not for the faint of heart. The patron bends over while taking a shot of their choice, gets punched in the brown eye by the bartender so hard they see stars, then punched in the eye with the tainted fist leaving them with a nasty case of pink eye.