1 definition by Shlobba McDogga
RUF is an acronym for Resting Ugly Face. Someone who has RUF is unattractive when emotionless, but is generally pretty when smiling or expressing other emotions.
Guy 1: man, is that your girlfriend? She's ugly man, you could do so much better.
Guy 2: nah man, she just has RUF. Her smile is beautiful.
Guy 2: nah man, she just has RUF. Her smile is beautiful.
by Shlobba McDogga March 24, 2018