by Ron Hoover November 8, 2018
an insult stated when all others ave been exausted, it can be considered both the best and worst at the same time. used as a substitute for stupid, unintelligent or weak, it is one of the least known canadian insults, as well as the worst.
by clouds_hate_you September 3, 2013
Stupid, as in "thick as a board", but especially so. Plywood made of five layers ("five ply") is a normal thickness of board. So "ten ply" would mean *exceptionally* stupid, as in: as thick as a *ridiculously* thick board.
For lunch you had nachos, pancakes, and some edibles, and you wonder why you feel weird now? You're fucking ten ply!
by Klendathu_Jones April 9, 2016