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Mordecai's best friend on the tv show Regular Show.
He is funny, annoying, and very cute.
Boy:Did you see what happend with Rigby on the Regular Show Last Night?

Boy's Sister:You know I don't watch that crap.

Boy: You suck.
Rigby by thepsycosidekick September 10, 2012
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Mordecai and the Rigbys 

A fire band from the legendary TV show Regular Show. Most remembered for they’re epic lip syncing.
Man that new Mordecai and the Rigbys song hit different
Tickling the undercarriage of the scrotum with two or more fingers
John would you like a Rigby 🤏🍒
Rigby by anonymous November 20, 2020
rigby 1. (noun) A shorthand for the the entirety of the all good traits a person possesses, despite the current conversation not being one that depicts that individual favorably. Originally an acronym from the HBO show "Silicon Valley" (episode 301 "Founder Friendly") for "Richard Is Great, But Ya'know," R.I.G.B.Y is defined by the character Gilfoyle as "...a dictionary patch...to compress all the nice-guys stuff."
"...he's to much of a prima donna to let someone experienced come in and run the company the way it's supposed to be run. Rigby."
--Bertram Gilfoyle

"I mean, seriously, fuck that guy. Fuck him. Rigby."
--Dinesh Chugtai

--Silicon Valley, episode 301: Founder Friendly
rigby by The Rev Mason Stone December 19, 2019
rigby come here rigby! good boy

and yes this is acualy my dogs name
Rigby by ilovedan_and_phil February 11, 2018
a man in possession of a foot-long schlong which may be classified as a weapon of mass destruction.
Word spread quickly around the college that Patrick had a rigby, however this proved to be unsubstantiated rumour.
Rigby by adolfkitler February 28, 2010