when someone puts their mouth on your scrotum and blows wildly as to make a flagellating sound, much like the "raspberry" you give on someones stomach to cause extreme laughter.
One night my girlfriend was fellating me and out of nowhere she planted her face in my scrotum and gave me a mullberry.
by Jamoca April 30, 2003
To rape a blind person
did you see steve mullberry that blind dude with thwe white stick
by francis July 27, 2006