go ape Definition

ape
noun

1. Any of several species of primate that differ from most monkeys, and resemble humans, in that they have a highly developed brain, lack a tail and are capable of walking upright.
2. non-technical
Any monkey or primate.
3. A mimic.
4. An ugly, stupid or clumsy person.

verb

aped, aping
1. To imitate (someone's behaviour, speech, habits, etc).

Thesaurus: imitate, caricature, mock, parody, mirror, parrot, echo, copy, affect, take off, take off on (US slang).

Derivative: apery
noun

Idiom: go ape

( Amer)
slang
To go completely crazy. See also apish.

Etymology: Anglo-Saxon as apa.