Being behind everyone else or moving annoyingly slow, usually when you’re meant to be keeping pace. You can lag on a walk, a night out, a group chat, anywhere. It’s a gentle nudge that says hurry up, we’re not waiting forever. Honestly, it’s the most British way to complain without fully kicking off.
"Oi, stop lagging, we’re gonna miss the last train. You’ve had three Greggs and still can’t keep up. Move it, champ, or I’m leaving you with the seagulls"