Muff-Bluff

When a girl fakes an orgasm, she is bluffing her muff muff.

Guys "have you ever been muff-bluffed?" - I would hope not!
Girl " I'm a regular muff bluffer" or "I've never had to bluff my muff"

Council Bluffs Sister

Incestual Relationship; also applies to other family members.

"Where's Jim tonight?"
"Oh, he's out with his Council Bluffs Sister again..."
"Wow. Won't their kids have hooves?!?"