Words that aren't used enough?

[Kevin Greene]

"You've just won the lottery."

[charlotte49er]

callipygous. J-lo is very callipygous!

[Epistaxis]

I use fortnight whenever I can. In fact, if someone says "two weeks" I'll reply with, "Okay then, a fortnight it is."

I like "ne'er-do-well," myself. Liliputian. Rapscallion.

Great choices.

I like "The hell you say!" A Shawshank reference. Not a word, more of a phrase, but still good.

I like calling guys cat rather than dude now. Dude is getting stale.

[Darth Biscuit]

Egads!

[mmmbeans]

"Hell's Teeth!"

"Cattywompus"

[Zcustom]

Octopoussoia

[Jangler]

Merry Christmas

[Samuel L. Jackson]

"Much obliged"

[car5nc]

"I reckon so"

[LifeisaGarden]

Gobbledygook but only because of thanksgiving.

Reintarnation or reintarnated. Gallivant. Skullet. Shituation.

[Darth Urious]

megalomaniacal

[Jackofalltrades]

Cataclysmic

[Hawk]

nowadays, I'd settle just to hear a please and thank you once in a while!

[Jackofalltrades]

Twerp