FOSM 

Accronym for Full On Stupid Mode

When it snows in Seattle, people drive in FOSM or "Full On Stupid Mode".

FOSM by donnabell November 26, 2010

Fosm 

1. fucking awesome
2. awesome in a sarcastic way

Willy K's blue plastic compass- raping whistle is fosm.

Fosm by Element 90 September 1, 2009

FOSML 

Funny On So Many Levels

That video clip was FOSML!!

FOSML by PA-AL April 29, 2010

Fosmozle 

For sure we will see each other and chill soon. ;-)

~ Girl to boy ~

Boy "See ya"

Girl "Fosmozle"

Fosmozle by ZestyS October 13, 2008

FOSMO

Friend On Social Media Only

My fosmo said the earth is flat. Thinking about ditching her.

FOSMO by Funtimeisover June 14, 2020

Fösmle 

The past tense of fösmle

The party was so fösmle
My day was so fösmle

Fösmle by XX not triple X December 9, 2021