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to chill, hang out, or relax with a group of friends and family
Hey Man, let's go mass.

Hey Man, I'm enjoying the massing were doing.

What a good Mass session
by poop December 13, 2003
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29
A Catholic celebration in which people celebrate the Last Supper where Jesus performed the ultimate sacrifice.
"Dude, mass sucks."
"Haha, you gotta go to Mass, lewser!"
by Soiled Undergarment August 17, 2003
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30
Shortened and somewhat corrupted pronunciation of the derogatory word 'dumbass'. Used to describe some kind of fool, or someone who's made a particularly foolish mistake, or some kind of epic fail.

Quite notably created by the infamous Dylan Basnett, along with other such words such as 'PAIN' and 'CREM'.
Dylan: I thought the current prime minister was Tony Blair?
Jack: MASS Dylan! Old Blair got the boot eons ago.
by michaelfishywishywish. July 21, 2010
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steven: damn do you see that girl ass

mike: hell yeah

jill: stop looking at mass
by king12 January 15, 2009
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33
A word meaning my ass, shortened to Mass
Example 1: "Dude, Mass hurts."

Exapmle 2: "Mass got pounded last night."

Example 3: "Stop touching Mass."
by GeneralMudButt November 30, 2011
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34
A verb meaning to measure the mass of something, despite the silliness of using "mass" as a verb.
Person A: Go mass that compound.
Person B: Did you just use mass as a verb?

Or

Person A: I've been trying to lose weight, so every morning I step on the scale and mass myself.
by Eliyahu February 12, 2012
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