Homer:

"Doe!"
"Doeth!"
"WooHoo!"
Homer talking really fast.
"Aahhh!"
"To start press any key, Where's the any key?"
"Aww Crap!"
"Woo Hoo, Look at that blubber fly!"

Bart:

"Aye Caramba!"
"Don't have a cow!"
"Eat My Shorts!"
"I didn't do it."

Gramdpa:

"I'm old, Gimme, Gimme, Gimme!"

Barney:

Belching

Cletus:

"I could call my Ma..."
Cletus's Theme Song

Ralph:

"I bent my wookie."

Nelson:

"Ha Ha!"