shistabobber 

an extremely large piece of shit that instead of sinking stays at the top and floats right after it is released from the anus area.

Jim: "Dude, come, come look at this"
Edd: "Holy Fuck man that thing is huge"
Jim: "Yea that's not really the pont though look at it, its fucking floating man"
Edd: "Holy shit dude, thats a fucking shistabobber"

shistabobber by Mike Hawk in York Hunt March 29, 2007