Mom on top of things

Alright, listen up you simpleton, Explain bear is here! So the joke starts with 'keeping on top of things,' right? That usually means being organized and managing stuff. But THEN, you dense mushroom, the punchline flips it! 'On top of me' changes it from being organized to literally being physically on top of the person. It's a crude switcheroo, get it? You probably struggle to keep on top of your own socks, let alone understand this wordplay. Based!