Wall biter

A derogatory term for someone who is showing severely stupid, unhinged, or weird behavior, like someone snuffing paint, or trying to eat snow. Also could be someone who is trying to steal kids crayons. Anyways, severe stupid, unhinged, corny, cringe, and or weird behavior.

Dude, I was talking to this girl on my school campus, and she started barking at me!! That's when I knew she was a wall biter.

Earlier today I saw someone trying to play chicken with a semi truck on the highway. They HAD to be a wallbiter.