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A man whose chosen profession and expertise is on the subject of the ass. Similar but less crude a term as "ass master" or "ass whisperer".
"Man that Antonio Luna is a real fessier. He may be a poor broke ass Mexican but man do those rich twinks keep chasing him."
Fessier by Hans Glockenspiel September 14, 2013
Related Words
Generally spelled FOSSie. One who uses "Free and Open Source Software" (FOSS).

Common views are that charging money for software is evil, that computer programmers should be modern society's slave labor, and that anything and everything related to Microsoft is evil.

Your common FOSSie will spend all day at Slashdot.org, giving negative moderation to anyone who dares to interject anything rational in the forums.
I don't know how those FOSSies talked the City of Munich into totally converting their IT to Linux-based, but they have been at it since 2002 with no end in sight. People are literally begging for Windows-based sanity at this point.
fossie by Chowned August 28, 2007
to dance with the use of splashy broadway choreograpy, especially the use of 'Jazz Hands'
Okay, chorus, I want you to fossie left then kick right. RIGHT! NOW WITH MORE JAZZ HANDS!
fossie by the notorious canoodler January 26, 2004
1. A FOSS luser.
2. A fossie; but usually more despective.
3. A GNU zealot.
4. A GPL freeloader.
5. A Linux lover.
6. A derogatory insult to a foss user. From a contraction (of the shortening) of FOSS + user.
7. A bastardarization of loser.
8. Misspelling of fusser.
- Self-righteous fossers love to hate closed source software; especially Microsoft's.

- Fossers think that paying for any software is evil; and hence, use every opportunity to convince you on that ground alone that their supposedly amateur offer is better; when in fact will eventually cost way more, once you take into account the time you would've saved using a pro tool and the steep learning curve.

- Pedant fossers usually turn away potential advocates and alienate users by extreme prickish attitude, mainly in their forums. They like to put down valid inquiries and requests as if it is the other person's fault, until they finally make them look like complete noobs.

- Fossers usually like sci-fi, d&d, cosplay, etc; have no real friends or a social life (obv virgins); and are ugly, morbidly fat/skinny and dwell in their parent's basement; like the trolls that they really are.

- In the end; fossers would like you to get by with only water, air, their shit, and the good vibes of the universe.

- Fossers are like the communists of the computer world. Ignoring the facts that in general people do not like complex, difficult to use glorified toys masquerading as apps and OSes; that they are also weak, meek, and stupid; and more so the reality that when the going gets tough, people become inherently more selfish (not altruist; ie, have to eat); and likewise their ideal software model is doomed to eventually fall apart.
fosser by manigordo December 4, 2010

FosseRamma

Norwegian Fortnite streamer known for his 100% sniper accuracy games.
FosseRamma Just had a 100% sniper accuracy game.
FosseRamma by <o/ June 6, 2018

Fossberg 

Fossberg is a name from Iceland that travels from generation to generation. The name is originated from Germany and it is assumed that Adolf Hitler created the name. A Fossberg is usually attracted to danish teachers and occasionally bangs them on the school table. A Fossberg is a rich mf that shits on gay people or people of color.
A Fossberg: Hey shawty.
Girl: OMG are you a Fossberg?
A Fossberg: Hell yeah, and you are a danish teacher right?
Girl: Umm yeah
A Fossberg: Lets fuck.
Fossberg by Vöffluvagninn March 14, 2022