What it means
Means something is really annoying you, stressing you out, or pushing you to the edge. You use it for people, noise, tech, chores, anything that keeps pecking at your patience till your brain wants to clock off. Very common for a proper fed-up moan.
Usage examples
"The lad in the office clicking his pen all day is doing my head in. I’m this close to launching it out the window."
"The dripping tap does my head in at night, I lie there counting every single drop until dawn."
"Trying to assemble this flat-pack with instructions in six languages and no English is doing my head in."
"This group chat's doing my head in, it's just memes, voice notes, and people arguing about nothing."
"That alarm in the flat upstairs does my head in every morning, same beepy little demon at six."
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Where it comes from
When something does your head in it wrecks your head, grinding away at your patience until you could scream. The repetitive noise, the maddening puzzle, the person who simply will not stop, all of it gets right inside your skull. Pure British and Irish exasperation.
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