VERB. Masturbating so as to prevent wet dreams and/or untimely hard ons.
Dude, I can't believe you had a wet dream last night! You really should start using preventative masturbation.
by batman1234567654321 April 05, 2010
The act of a married, or romantically committed, Man pleasuring himself regularly so as to eliminate the temptation of being unfaithful.
If I didn't do some Preventative Masturbation, I would be chasing after every skank in the neighborhood.
by Niems04 January 09, 2014