Crude but totally funny… you want me to wash my what?

My husband was on the phone with a friend of ours the other day.  Our friend was going to pick up his girlfriend so he said, sort of jokingly.  “I’m going to go wash my armpits then pick her up.” 

It was on speaker phone so I could hear him, so I piped up (this is the crude part), “Wash your dick too while you’re at it.”

I said it kind of loudly because I was a bit away from the phone.  So my son who was playing outside in the backyard heard me.  Driving around on his little scoot bike back there he said in a sort of sing-song-upbeat-question voice to me, “You want me to wash my dick?”

Luckily he couldn’t see us and he doesn’t even know what the word “dick” means because needless to say, all the adults on the scene were laughing.