rolling a one 

Failing at a task or fumbling a job/task/situation; usually something simple. Based on the twenty-sided dice system used in games such as D&D, in which rolling a one usually constitutes an automatic failure (called a "fumble").

When he was unable to repeat what his Professor had lectured at him, James made a claimed of rolling a one on his "Listen Check".

rolling a one by Michael S. Freitag September 30, 2005

rolling a one 

Slang term for not coming into work by rolling dice and getting a 1.

"Hey where is wacho?"
"He rolled a one."

rolling a one by tehlolz March 24, 2005

Rolling a moldy one 

Used when you get a really bad trip from smoking a blunt

Man 1: Dude I don't feel too well after that blunt
Man 2:Oh bro were you rolling a moldy one?

Rolling a moldy one by Has anyone seen my son Nemo February 27, 2019