Struth! I think you all need to lighten up.

"potty-mouth"??? "smack talk"??? What the...., are you going to give him a good smack and sit him on the potty. How about washing his mouth out with soapy water?
Wouter, you're a naughty, naughty boy. Now go sit on the potty till you can play properly.
Sheeeesh! (oops! Now I'm in trouble)