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When you are getting your your junk pounded on by a significant other (e.g., a partner, stranger, lover, hornswoggler) whose hands are sandy af.

The act of really going to town on someone's private parts with hands / feet filled with sand.

A "Sandy Handy" but with a little more gusto!

This is a non-gender bias term, anyone can give or recieve a montauk mash job as long as thier extremities are sandy and you are really "just mashing it." You also don't have to be in Montauk, or on a beach.
"Whoa look at those two homeless guys giving each other Montauk Mash Jobs under the boardwalk" -- an angsty teen witnessing a grown man receive a sand filled hand job on Long Island

"Yeah she gave me the ole' Montauk Mash Job" -- a guy with severe sand burns on his dick

Guy 1: "She was trying to grind my dick into dust with her sandy hands"
Guy 2: "So she gave you the montauk mash job"
by #SquidKid March 13, 2017
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Jun 20 Word of the Day
Marginalized Orientations, Gender identities, And Intersex. it’s meant to be an all inclusive umbrella term for asexuals, homosexuals, multisexuals, trans people, and intersex people. Alternative to LGBTQIAP+
Alternative to MOGII, easier to pronounce.
The MOGAI community in my city is very friendly.
by sebasty September 04, 2014
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