look up any word, like donkey punch:
 
1.
the act of sitting on the face of another and pressing their face into your bare ass while clenching, while doing so it is necesary to shit into their mouth... taco shit are preffered but any will do.
man...after eating taco johns i gave justin the worst rusty bear trap.
by M.A.C July 27, 2006
 
2.
this is where a person clenchs someones face in their buttcheeks and then proceeds to excrete into their mouth.
awww i've just been rusty beartrapped.
by Ben Warton May 10, 2008