1
informal
: very fond, enthusiastic, or excited
She's bonkers for/about opera.
He's bonkers for/about her.
The fans went bonkers when their team won.
2
informal
: very angry, annoyed, or bothered
Faced with the choice of being driven bonkers by their colicky newborn or inviting an outsider into their lives, Phil and Julie sanely decide to find a nanny.—Booklist
And the internet went completely and utterly bonkers about it, with critics climbing over one another to criticize Cyrus …—Tom Hawking
3
a
informal
: surprisingly or shockingly excessive or outrageous
bonkers prices
a bonkers accusation
b
informal
: going beyond what is normal or conventional in a way that is fun, impressive, exciting, etc.
High-end, high-concept, completely bonkers brilliance: that's what arts festivals are for, in my opinion.—Max Rashbrooke
One of The Future's zanier aspects is a bonkers eight-minute R&B arrangement of the Irving Berlin standard "Always," complete with horns and background vocals.—Anthony DeCurtis
The Queen of Black Magic is a rollicking rollercoaster of a horror flick. … It's the sort of bonkers throw-out-all-the-stops ride that brings to mind Sam Raimi's Evil Dead films …—Jason Adams
4
informal + sometimes offensive
: not mentally sound
Meanwhile, the greedy trustees of her fortune are trying to confuse her enough to have her declared bonkers so they can make their jobs permanent.—Ray Olson
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Merriam-Webster unabridged
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