flitso 

Funny little man that loves hanging out with Akinsoft (the most funniest relatable man in the known universe)

I'm such a flitso.

flitso by Akinhard July 7, 2023

flatso 

Fat chick, no boobs.

Size 22 chick, "A"cup is a flatso.

flatso by Galicia December 9, 2006

Flitsham 

Short for "Friend who Lives In The Same House As Me"
Because roommate isn't the right word and housemate or flatmate doesn't quite name it.

I totally heard my flitsham masturbate the other day!

Flitsham by PimPee April 4, 2009

flatso 

A fat girl with small tits

That flatso looks like my uncle Joe with long hair!

flatso by Michael Hunt August 6, 2003

flatsound 

mr. steal yo girl

Oh, you're on urbandictionary, meanwhile flatsound is stealin' yo girl.

flatsound by xxxcliffbarxxx October 26, 2013

Flatso 

(N.) An Overweight Adult Female who's a Member of the "Itty Bitty Titty Committee." Usually UGLY and SMELLY, these broads are the worst (and usually fattest) of the Bertha Bovine family.

Mrs. Hunt is a Flatso.

Flatso by G-Union 2 November 10, 2004

flatsound 

A lofi bedroom musician from SoCal with a large following on tumblr

Yo man, you hear that new flatsound song on tumblr yet?

flatsound by h3ythere April 29, 2013