A firm little brush-off that means go away, stop bothering me, or don’t be so cheeky. Usually said when someone’s chatting rubbish or pushing their luck, and it can be half-jokey if you chuck in a grin. The phrase got a big boost in the 1980s after Norman Tebbit used it, but it’s long been knocking about in everyday talk.
"Kev rocks up begging for a lift and a tenner. I’m outside Greggs in the drizzle, like, on your bike, mate, behave."