Naw, it’s “large family” humor. LOL! There’s always somebody knocking on the bathroom door around here. There are 11 of us.
My niece used to live with me, and we played the knocking on the bathroom door as a joke as well. we’d yell, room service - need TP for your bun hole? Ok, kind of crude, but when done with a dialect it was hilarious. (I think the bun hole remarks was from Beavis & Butthead).