When a male is in the middle of a threeway and double penetration is involved he may call "shotgun anus", giving him the right to stuff the girl's pooper with his fat choad. The first person to call "shotgun anus" has dibs on the chick's crap factory. See choad, and/or calling shotgun for further reference.
Shall we double take that chick? Oh sweet......SHOTGUN ANUS!!
by Johnny Albright March 01, 2005
1 more definition
The phrased yelled before two guys tag team a girl to determine who is going to get anal.
"Dude, lets wreck that chick. And guess what, SHOTGUN ANUS!"
by HumperNDumper02 September 08, 2009