After engaging in anal with a female using a condom, pull out but leave the condom in the anus. You then tell her to go take a shit. The shit comes out into the condom like "casing" sausage. Hence "Butt Sausage"
by Spacehead333 September 8, 2015
Get the Butt Sausagemug. by Joe J. April 22, 2008
Get the Butt sausagemug. by Deep blue 2012 November 13, 2009
Get the Butt sausagemug.