by GurnMon October 10, 2005

An act of masturbating. Usually is said as if you were playing the penis game. A reatarded word made up by retarded people.
In a classroom: oh my god robert stop mastacating!!
In a crowded elevator with a friend: masatacate!! MASTACATE!!!
In a crowded elevator with a friend: masatacate!! MASTACATE!!!
by ya im jewish October 08, 2005

Mom: Son, you have another phone call. Do you want me too tell them your eating diner?
Son: Yeah just tell them I'm mastacating! They'll deffinatley stop calling
Son: Yeah just tell them I'm mastacating! They'll deffinatley stop calling
by Nicole Morrow September 25, 2005

by FaShizzle March 06, 2004
