Shit a buck
Inspired by a typo in the caption of a newspaper picture about deer hunting (shot vs shit), it has come to mean taking a massive dump.
"Oh, man...I've been backed up, but now I feel like I just shit a buck."
Shit Buck
The "Shit Buck" or act of Shit Bucking is the practice of smearing human or animal feces onto one side of a dollar bill and placing it, feces side down, in an open, public area. Upon placement, those responsible should move to a safe and close location with a good vantage point to view the fruits of their labor. The goal is to trick individuals into picking up and even pocketing this "shit buck." It is an added plus if said location is within earshot and if the event can be videotaped.
"Holy fuck, dude, that bum totally just wiped the shit off of that shit buck before stuffing it into his pocket!"