One Short of A Six Pack

A term used to describe a person who is not all there. A person missing a marble or two - a few percentages off from being full blown retarded.

"I can't believe that guy just walked into that glass door - what is he...one short of a six pack?"

by D. Ferrel September 30, 2003

one beer short of a six pack

Someone who lacks common sense. Not quite mentally competent.

You're one beer short of a six pack. You have no idea what you're talking about.

by Oldman. February 20, 2018