Gag Words

A Running Gag that involves repeating a funny-sounding phrase when least (or most) expected. Often Lampshaded as an Overused Running Gag due to its randomness.

Unlike a Catch Phrase, Gag Words are not associated with a character. Compared to Arc Words, they are less symbolic than just plain silly.

Anime & Manga

 * "Fooly Cooly," from FLCL.
 * "Gatchabagoose" from Elf Princess Rane.

Comic Books

 * Marvel Comics mercenary Deadpool enjoyed using the words "Chimichanga" and "Duct Tape" during the "Cable/Deadpool" series. When asked why, he commented that they were funny words, like "Spatula, Rumsfield and Zygote."
 * "Potrzebie" in Mad Magazine.

Literature

 * "The Hawley-Smoot Tariff," from Dave Barry Slept Here: A Sort of History of the United States: "Quite frankly we have no idea what this is, but we think it has a wonderful ring to it, and we just like to see it in large bold letters."
 * He may have got it from Ferris Bueller's Day Off, where the incredibly boring teacher is asking about it ("Anyone? Anyone?")
 * Dave Barry's Only Travel Guide You'll Ever Need uses the phrase "fish of your brother Raoul" and a few variants in several languages.
 * And Dave Barry Hits Below the Beltway uses the phrase (and accompanying image) "giant prehistoric zucchini."
 * Did you know it was almost called the Smoot-Hawley tariff?

Live Action Television

 * "Lemon curry?" in Episode 33 of Monty Python's Flying Circus.
 * Not to mention "Albatross!" from its titular episode.
 * And "Semprini", which for some reason is considered a swear word.
 * "OUT!"
 * An episode of the US version of Whose Line Is It Anyway? had Colin yelling 'The cat!' or 'Meow!' at any moment when he couldn't think of anything else.
 * Ryan Atwood and Sandy Cohen humorously repeat "Yogalates!" in episode 12, season 1 of The OC.
 * "Schnaps" on episode 2 of season 3 of The Big Bang Theory
 * On Seinfeld, Jerry attributes the popularity of salsa to people thinking it's fun to say.

Newspaper Comics

 * Classic example: "Notary Sojac" from Smokey Stover.
 * "Judo chop", among others, in Peanuts.

Radio

 * "Yin tong iddle I po" from The Goon Show.

Web Original

 * "Hamsterjelly" from Ask That Guy

Western Animation

 * "Huggbees" in one Freakazoid episode.
 * Frisky Dingo had dozens of these. Killface even used "Hawley-Smoot" once.
 * "Narf!" and "Poit!" from Pinky and The Brain.
 * Not to mention "Zort!", "Troz!", and on one occasion, "Fjord!"
 * "Spoot" was often used on The Angry Beavers.
 * On one "Aesop and Son" segment from Rocky and Bullwinkle, characters keep saying "Hoot Gibson" (the name of a popular Western actor). Another episode had "succulent".