The act of taking a beer bong while sitting on the shitter.
Sean was trying to get drunk but really had to take a crap, so he asked Ryan to give a bongkin to him while he defecated.
A 'Bongkin' (Bong-Kin!!) is a pumpkin that has been given the sweet, sweet holes of life. It is a cross between a pumpkin and a bong...duh!!
It was Halloween, so to celebrate we made a Bongkin with a left over pumpkin. We would have blown it up, but Sally is no longer with us after the accident. Darn shame as well, she gave great head after she got high smoking from the Bongkin.