knuckle guard ( synonym found)
Definition of knuckle guard:

(n) : an idiot; a stupid or inept person
"don't stick that screwdriver into the live electrical outlet, you knucklehead!"
Definition of knuckle guard:

(n) : an idiot; a stupid or inept person
"don't stick that screwdriver into the live electrical outlet, you knucklehead!"
Back to Top