A buttmonkey is a penis put in someones butt.
Have you ever heard of "spanking your monkey"?
by Artimus DarkMorde March 07, 2004
a monkey of or pertaining to the butt.
"dude check it out! a butt-monkey!"
by jim May 07, 2005
person or persons employed at a state mental institution pretending to work in order to draw a paycheck while only coming to work on paydays.
Paul has been the top butt monkey at New Mexico State Hospital since 1999.
by Wanda May 08, 2003