What you wanna say is

"Look here, staight up, you smell of shit. Mind taking a bath coz i cant take this no more! It's making me gag, seriously, i get so sick, and it pisses me off so much. Obviously i'm trying to hold it in but soon it's going to piss me off so much i'll start beating small kids about the head with a shoe, so on a basic level, it's for the kids. Really, you smell bad."