Poppycock.

A friend of mine was telling me she'd been accused of sexual harrassment by her male boss, and I told her she should have answered:
Poppycock! I didn't want one INCH of your Poppycock!

Zounds, egad, and all those.

Scrumptious.
Free-for-all, which is also how we pronounced on of our college dorms, really called Freefer Hall (the initial F kept disappearing from the walls, too).

Splurge. Splurge. Splurge.

Spelunk. As in Calvin and Hobbes, that is, where it's the sport of throwing large rocks *spelunk!* into the pool...