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1. an old-fashioned person

2. an elderly person
Why do I have to listen to this old fossil?
by Light Joker July 13, 2005
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A brand that is mainly known for their high quality, but cheap about $60-80 watches.
"I just got this awesome new Fossil watch."
by Masta March 12, 2005
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A person, typically a no life, college-aged, high school graduated degenerate, who regularly attends high school parties hosted by those who are still in high school.
High School student 1 - Why is John at this party? Didn't he graduate from high school in 2007?

High School student 2 - He did graduate in '07. Man what a fossil.
by SLK Creighton February 01, 2011
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FOSSIL is a standard for allowing serial communication for telecommunications programs under DOS. FOSSIL stands for Fido Opus Seadog Standard Interface Layer and was made by a group of Fidonet sysops to allow software work on different machines.

I installed a new FOSSIL driver for my BBS!
by Homer P. Simpson September 01, 2006
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Out-of-date, old, conservative, becoming exhausted or used up. Generally an old timer with no future.

Taken from "fossil fuels" it can refer to someone or something that is generally hurting young people or future generations.
"Man, that politician is such as fossil!!"

"Yeah, he actually owns an oil company..."
by Lifeguard007 March 29, 2014
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Joe weller: I feel depress because of all the YouTube drama and I'm gonna take a break of YouTube
KSI:you fossil tryna copy me
via giphy
by Hakeem Kanneh July 11, 2017
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