To be chilling, doing nothing, just like moss, the commonly known fungus that just chills out on rocks.

Origin is believed to be Pickering, Ontario, Canada, a city that is part of the Greater Toronto Area.
Aldo: What it do, player?

Brianna: You know, just mossin'.
by Aldo Perri January 28, 2008
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to grow organically from a fixed position, with growth stimulated by chronic consumption
After hitting numerous bowls, Max is mossing hard in the LA cafeteria.
by Mossman_99 March 02, 2009
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An urban word for chillin' or just doing nothing
Parental figure: " hey what you doing up there?"
Kid: " just Mossin with the boys
by The man with all the knowledge January 27, 2011
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Smoking mass quantities of weed, usually with friends, while at the same time not doing anything particularly interesting - or chillin'.
Hope: wuttup brah i got a half ounce of weed from some kid who wanted me to do his homework.

Jordan: lets get to mossin' then beeeyotch!!!
by JSLOBtheCHEF January 16, 2009
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When a group of people are playing football and one person makes a great catch over a defender, in a Randy Moss like fashion.
Dis nigga was mossin on you bruh, he went up and jus grabbed it out the air.
by Joe Stephens September 04, 2006
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