Verb. The act of partaking in masturbational activity using a baseball mitt. One must tenderize their preferred mitt and likewise toughen the area to be stimulated in order for successful mittsturbation to occur. After many sessions with one's mitt, the mitt will be considered "broken-in". Each session brings the mittsturbator closer to this desired state of mitt. This is an extremely advanced technique in terms of self stimulation, and should only be exercised when one considers himself (or her...self..) ready. Prerequisite: one must be a major leaguemasturbator in order to commence in minor league mittsturbating.
John mittsturbated with his new Easton glove, which ultimately resulted in a pop-fly to center field.
Stanley asked his girlfriend to mittsturbate him. Unfortunately, she could not because she did not own a left-handed glove.
To masturbate only using one's mind. Titillation comes from stimulation of the brain. Ejaculation often indicated by concentrated spit being ejected from the mouth.
Original meaning: Mind-masturbate or masturbate with your imagination or mind.
Better used as: have to think so hard about something that it's almost like you have to masturbate with your mind.
Or simply use the short MM for mind-masturbate.
Bill: Dude, what's up, you look fuck-up!
Gabe: Man, the exam was so hard, I had to minsturbate the answer!