1 definition by _Jules_

1

An abbreviation, meaning "fuckable-on-site". Used to classify extremely sexy people who arouse others to an immediate, uncontrollable frenzy.

Jared Leto (of 30stm) - inherently FOS. No question.

by _Jules_ December 17, 2008

Get the mug

Get a FOS mug for your sister Nathalie.

• © 1999-2021 Urban Dictionary ® • advertise • terms of service • privacy • dmca • bug report • help • blog • data subject request

• © 1999-2021 Urban Dictionary ® • advertise • terms of service • privacy • dmca • bug report • help • blog • data subject request