Top Definition
The act of simultaneously masturbating and stabbing the shaft of one's penis.

Pronunciation note: emphasis is on the STAB portion of the word.
Grandma: Hi Johnny, so nice to see you again. What have you been up to lately?
Lil Johnny: I usually just maSTABate in my closet.
Grandma: That's not something to say to your grandma, Johnny...
Lil Johnny: SHUT UP YOU OLD BITCH!
by gfaisjdfjjwejo July 08, 2016

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