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.)
-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
Damn dude, that shit's rough.