Means a fizzy soft drink, especially in the North, where you’ll hear bottle of pop the way Americans say soda. It also doubles up as a handy verb meaning to go somewhere quickly or for a short errand, like I’ll pop to the shops. Dead simple, dead cosy, and weirdly versatile in everyday chat.
"I’m just popping to the shops, you want owt? Grab us a bottle of pop and some biccies, yeah. No kale, I beg."