*groan*
Actually, the correct response is, “Boo! Boo! Bad! Bad!”
It was part of a skit full of such bad jokes that was in Grandpa’s vaudville show.
Zenas: Wait a minute! You married a pea hen?
Toby: Yes, and then ...
Zenas: (interrupting) Do you believe in mixed marriages?
Toby: Oh, no! Me and the pea hen’s both Baptist.