What it means
Batty means a bit mad, daft, or charmingly off their trolley. It's usually light, teasing stuff, not a serious mental health label. You'd use it for someone making odd choices, getting carried away, or chatting pure nonsense in a way that's more eye-roll than alarm.
Usage examples
"Gaz bought three hundred quid trainers for the school run, then queued an hour for a limited drop. Mum said he's gone batty."
"Gran has gone proper batty in retirement, knits jumpers for the neighbour's dog, names her tomato plants and writes Christmas cards to the woman on the weather report."
"My mate's a bit batty after three days at the festival, keeps offering strangers tea bags and calling everyone Steve, even the dog of the lad in the next tent."
"You are absolutely batty if you think I'm getting on a Megabus at 5am just to save twelve quid."
"She's gone a bit batty since payday, booked bottomless brunch, a tattoo appointment, and flights to Malaga all in one lunch break."
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Where it comes from
It comes from the older British phrase bats in the belfry, meaning someone seemed a bit touched or muddled in the head. By the late 1800s, batty was already being used on its own as a shorter, breezier way to say daft or slightly mad, usually with a teasing, not sinister, vibe.
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