FAS 

Stands for "Fat Arm Syndrome"

A person with more than necessary arm fat.

"Can you see Mary's FAS flapping in the wind?"

FAS by Lorla April 16, 2008

FAS 

Flat Ass Syndrome. A bad condition where a person (usually a guy) has an unnaturally flat ass and makes their pants look like potato sacks.

Person 1: HOLY FUCK. That guy has no ass!

Person 2: I know! They must have FAS.

FAS by lovely_cupcakes October 28, 2009

fas 

1. "Fetal alcohol syndrome"
characterized by drowsy looking eyes that are unusually spaced out on a face. Not to be confused with akimow or akimo

2. "fat ass shit"
the shit that comes out of an overweight ass.

Jim: I heard you got fas
Rob: shut up. I got akimow
Jim: that's the same thing you retard
Rob: I thought you meant "fat ass shit"
Jim: No, that's what Marty produces after he takes off his bastedo
Rob: I thought that was bukake?
Jim: It's spelled bukkake akimow

fas by Rob January 25, 2005

FAS 

Finger Activated Stud: A guy that needs someone, usually his girlfriend, to finger his asshole in order for him to get turned on and achieve orgasm.

Tina: Hi Tammy, how's it going with your new boyfriend?
Tammy: Gosh Tina... I don't know about him. He's great, but he's a FAS.
Tina: You mean you had to finger his ass?
Tammy: That's right, and I think I lost one of my Lee Press-on nails inside him!

FAS by jcrex July 19, 2006

fas 

fake and sketchyy. a fake friend. a liar

your being hella fas

fas by bbyjkillz October 9, 2007

fas 

flip a shit

if my mom sees how trashed this room is, she's gonna FAS!!

fas by ahead of her game February 1, 2010

fas 

Fake a Smile, pretending to be happy for someone

a true friend fas for you, but a true friend doesnt let them

fas by goodbyelove July 21, 2017