The act of masterbating while using mustard as a lubricant.
Tommy got caught mustarbating on Tony's bed, he was using dejon mustard.
by TuckerB1 January 08, 2006
when one slathers hot mustard on their private parts and uses it as a lubricant to help make masturbation more pleasurable. Usually done in desperation when no other lubricants are readily available.
After having a romantic McDonald's dinner in their car. Teens Jack and Jill experimented mustarbating eachother with the McDonald's mustard packs.
by Julian Ray October 13, 2013

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