What it means
Toilet paper, plain and everyday UK wording. You’ll hear it at home, in a pub toilet, or in an office when someone realises the holder’s hanging on by prayers and cardboard. It got extra famous during the 2020 panic-buying circus, when people were stockpiling it like the apocalypse was gonna be decided in the bathroom. Bog roll means the same thing, just a bit blunter.
Usage examples
"We’re down to one loo roll and the flatmate’s had a curry and three coffees. I’m legging it to the corner shop, wish me luck."
"We are down to the last loo-roll, can you grab some on the way home?"
"The dog got hold of a loo-roll and shredded it all over the hall."
"Can someone stick loo roll on the shop list because there’s about two tragic squares left in there."
"He moved in yesterday and somehow forgot tea, milk, and loo roll. Proper rookie behaviour."
Where it comes from
It’s a straight British compound. Loo has been a common UK word for toilet since the 20th century, and roll is just the rolled paper itself. Put them together and you get loo roll, a completely ordinary everyday name for toilet paper with no deeper magic hiding in it.