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Foss is the description of someone who acts or is absurdly retarded or mentally ill. Foss is usually meant as an insult or a derogatory term towards someone else.
“You are such a stupid fucking Foss!”
“What a Foss...”
Typical Foss...”
“Don’t be a Foss.”
“You look like a tumor, Foss.”
“Dumb Neanderthal/Homohabilis.”
by Shane Mallick October 17, 2017
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FOSS is an acroymn which refers to Free and Open Source Software. A term nessicary to describe two releated entities, yet different and seperate in some important philosophies.

This acroymn has its origins when the Free Software Foundation proclaimed their GNU General Public License as not actually open source, even though it is considered an open source liscense and is compliant with the Open Source Definition as described by the Open Source Initiative.
The FOSS communities are related, and differ only in extreamly judgemental geek lexicon and proclamations.
by Indrid Cold August 08, 2004
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plural: Fosses
Fresh off the slave ship. A person who thinks he or she is black; A person who moved from Africa to somewhere else; A regular black person. This term is similar to the word Fob but is more focused on Africans and African Americans.
My new friend from Niger Luke is a true foss.
Dave Chapelle the foss is my favorite comedian.
by dave chapelle (TML) July 25, 2006
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(verb)

-stopping the smoke from escaping a bowl/pipe or bong by holding your hand over the opening
-cover the hole

To foss, fossing
bruh, foss it

Yo foss it foss it!!!!
Make sure you foss it
by st0n3rchiK August 17, 2018
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is someone who is nosy, and wants to know everything.
yo b; i heard about your man. (den someone is like "i wanna noe, i wanna noe"....your too damn foss! move and g'long :P
by BabiieGurl April 03, 2009
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Fresh Off the Slave Ship

A term typically used to apply to people when they are dressed too gaudily for a given occasion. It is believed that when Africans were brought to America as slaves, they thought they were going on a cruise and wore their best clothes. When they landed, they found out that it was all for nought.
Look at that Persian all dressed up at the DMV. He is such a FOSS!

You're wearing Gucci, Armani, Dolce & Gabbana, and Christian Dior all at the same time? You are an incredible FOSS!
by Dip-meister July 23, 2009
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A general state of feeling like the boss. It is not referring to being at work. It is more of a state of power, a temporary feeling. You are the shit for a minute. Used as an adjective to describe a feeling.
You must feel so foss with that new car man.

"That outfit your wearing makes you look like the boss."-Person 1

"Yeah man, im feeling foss."-Person 2
by fossboss August 12, 2009
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