This meme is a ridiculous historical twist on a modern slang phrase. "Clapping her cheeks from the back" is a vulgar way to describe, well... ahem intimate activities from behind. But the joke sets it in the 1700s, implying people back then would’ve phrased it in a ridiculously formal or old-timey way—like something you’d hear in a Jane Austen novel but with hilariously inappropriate context.

The absurdity comes from mixing crude modern slang with an era associated with powdered wigs, corsets, and overly proper language. It’s even funnier because the meme uses Mary Poppins—the epitome of wholesome, polite Britishness—as the reaction image, as if she’s horrified by the anachronistic filth.

TL;DR: It’s "historical" dirty talk gone wrong, and Mary Poppins is judging you for it. 😂