When a man inserts his penis into a womans anus. (Because when you pull it out, it is brown like rust.)
by Fack Meecough December 1, 2003
Get the Rusty-penismug. by manuel diego December 18, 2007
Get the rusty penismug. by RATCHEF November 5, 2020
Get the Rusty Rat Penismug. by RATCHEF November 5, 2020
Get the Rusty Rat Penismug. by James Malcom June 11, 2008
Get the Rusty Tree Penismug.