I inadvertently discovered just now that "whoo-hoo!" in ROT13 is "jubb-ubb!" Worth remembering and repeating! And "d'oh!" is the Klingon-sounding "q'bu!" (Imagine the fun you could have with your friends! When something goes wrong, say "q'bu!" "What'd you say? K'boo? What's wrong with you?!")
Jubb-ubb!
(Don't care? Try "zru" or "fahu"! It's fun for the whole family!)