спятить

1) General subject: be bats, be bonkers, be off nut, be off one's nut, be off one's onion, be off one's pannikin, be off onion, be out of (one's) senses, be round the twist, crack one's brain, gaga, go balmy, go barmy, go buggy, go bugs, go loco, go mad, have bats in belfry, run mad, to be bonkers, to be off (one's) nut, to be off (one's) onion, to be round the twist, go haywire, go off head, go loopy, take leave of senses, go nuts, go off one's rocker

2) Colloquial: to be out of (one's) senses, off rocker (You're both off your rockers! Вы оба спятили!), lose one's marbles

3) Rude: go off chump, go off nut

4) Scottish language: be off at the nail, go off at the nail, to be (go) off at the nail

5) Jargon: flip, get bananas, go off (one's) onion, go bonkers

6) Makarov: be out of senses, go off (one's) chump, go off (one's) head, go off (one's) nut, go off the hooks, go round the bend, crack brain, crack brains, crack up