A (more polite*) euphemish for apeshit which is a behavior (alleged?) noticed in higher primates in Nature (and likely more) in zoos. When one get enraged at another or threat, often the 1st response is to find the nearest (or provide) droppings and throw at the adversary.

Commonly used figuratively for anyone with volatile or explosive rage

*apedung for those more sensitive
"Boy, did the minister go apeturd on the Press when caught embezzling
by AmboNec November 17, 2013
Get the apeturd mug.