Bananas, nuts, crazy, wild, ballistic, cuckoo! Any thesaurus will do.
Quite commonly used word, not slang, used to affectionately describe a state of mind such as the above.
Hand-in-hand vocabulary with for example: gor-blimey, bastards!, bollockchops, well I'll be a pissed on candle, crikey, shove it up your arse, and bollocks! Used in the UK at least.(>London<)
Humorous sub-text in use due to its (click the link) 'bonk' attribute, as in copulation of the 'Carry On' sort also bonk could be a hit, say on the head that has comedy value.
To enhance, say: 'bloody bonkers' or 'blimmin bonkers' or 'bloomin bonkers' or 'absolutely bonkers' (esp.)
-He's definitely gone bonkers, that boy.' (crazy in the head)

-They told me they lost the paperwork.
-Did you get mad?'
-I went absolutely bonkers (mad at them)

-I could have sworn I left it here on the frigde, I tell you I'm going bonkers

by Ja-' Chri-' UK April 27, 2006
Get the bonkers mug.
Mad craving for the butt hole to be fingered- causing the person to go "bonkers".
he had a bonkering but he had no partner, so he used his own finger
by Bonkering December 2, 2014
Get the bonkering mug.
That’s just so bonkers!!!
by cash.max November 12, 2017
Get the bonkers mug.
tiddiessss
wow she has big bonkers

omg dude why are u looking at her bonkers
by luigigotbigtiddies November 21, 2018
Get the bonkers mug.