Not sure if this was a misheard word or a really quick recovery

I’m drying Milo off after his bath…

Milo: “Ow! Careful with my nut crack!”
Me: “… Milo, did you just say ‘nut crack?'”
Milo: “Yeah.”
Me: “……”
Milo: “What? That’s where I crack nuts! I just stick them between my legs and go ‘Grrr!’ and they crack.”
Me: “……”
Milo: “Seriously, Mom. That’s what happens.”