Flat Up 

A combination a “straight up” and “flat out”. It’s more powerful.

He flat up lied for us.

Flat Up by Barbara_Bangkok May 27, 2022

Flat up 

When a bubbly liquid, like soda, goes flat

"I hate buying 2L bottles of coke, they always flat up quickly"

Flat up by philcagitz July 29, 2024

up flat down 

term for a type of snowboarding jib that slants upward to a flat part and then slants downward again. exellent for showing off your skills.

"Dude, I totally nailed my backside 540 on that up flat down box."

up flat down by boardsport7 January 27, 2008

Flatuphobia 

Fear of farting. This term initially referred to the fear of accidental bowel movements, however it is commonly associated with enclosed spaces such as elevators or in very quiet environments, such as a church service.

When you fear that you may not be able to safely fart without soiling yourself, you are suffering from flatuphobia.

Flatuphobia by Cornfire September 26, 2009

Flatuphallic 

Someone who loves the smell of farts.

Craig was such a flatuphallic that he would press on his girlfriends stomach when he went down on her to get a face full of fart.

Flatuphallic by Macro Master October 10, 2011

Flatupus

A Woman/girl with a extremely to completely flat chest.

Man Katie Holms is such a flatupus..

Flatupus by omgwtfwhoamI? January 10, 2009

Flatuphobia 

(flat-chew-fobia) The fear of farting esp. The fear of pooing your pants while farting.

"Dude this diarrhea is bad enough to give me flatuphobia!"

Flatuphobia by Shar Ting January 12, 2014