Catchphrase

A catchphrase is commonly uttered line uttered by a character. Catchphrases often become associated with the character in question and if they become popular enough may even become associated with the show.

The two most known catchphrases on Futurama are Farnsworth's "Good news, everyone" and Bender's "Bite my shiny metal ass".

Catchphrases
Catchphrases used by the characters:

Zoidberg

 * Woop-woop-woop-woop!
 * Hello!
 * (Insert famous person)? I love that guy!
 * Hooray!
 * Awwww...

Bender

 * Bite my shiny metal ass
 * Me, Bender
 * We're boned
 * Bender is great
 * Neat! (This is always followed by Bender taking a picture with a purple or green camera.)
 * Fun on the bun (Apparently this catchphrase was briefly deleted from him during the events of "Overclockwise".)
 * Do the Bender!
 * Death to humans!
 * Another job well done.
 * I'm back, baby!
 * Shut up [someone], I know it.
 * Let's go already!
 * Cheese it!

Farnsworth

 * Good news, everyone
 * I am already in my pajamas
 * Sweet Zombie Jesus!
 * Wernstrom!
 * Fuff!

Fry

 * Crud!
 * Help! Police!
 * He's dead

Leela

 * Hi-yah!
 * Oh, Lord

The Conrad family

 * Sweet (insert animal or thing) of (insert place)! - Hermes, LaBarbara and Dwight
 * My Manwich! - Hermes, LaBarbara and Dwight

Others

 * Guh/buh/spluh/fluh - Amy
 * That's prepostrous! - Cubert
 * Bam! - Elzar
 * My kajigger(s)! - Hattie
 * Watchacallit - Hattie
 * (sigh) - Kif
 * I am Lrrr, ruler of the planet Omicron Persei 8! - Lrrr
 * Haroo! - Nixon
 * BRANNIGAN! - Nixon
 * Ha-Haaaa! - Roberto
 * Whoahs! - Sal
 * I'm Scruffy, the Janitor. - Scruffy
 * Yep. - Scruffy
 * Leela... - Zapp
 * Ho ho ho! - Robot Santa Claus
 * Ba-GAWK! - The Hyper-Chicken
 * Oh, boy! - Fat-bot