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15.
Instead of saying "Rediculous" sounds better when said out loud. (Re-Donk-U-Louss)
Mainly used to either sound like an idiot, or just sound like you know bigger words.
i,e:

Ariyth The Pony- You're so REDONKULOUS!
Donkey- ._.

Annoyed Teenage Girl- Ugh mom, you're so redonkulous!
Mom- Can't you say 'rediculous'?
Annoyed Teenage Girl- Pfft, mom. No one says the real words anymore! >:l
by O:HolyCrabapple:l May 22, 2010
 
8.
Basically just a funnier version of the word ridiculous, but also having a "dick" or "dickhead" connotation. Invented just after "redorkulous", which has a dorky connotation. And now, I will enlighten you even further...

Origin: Familiar with the phrase "donkey dick"? Well, you can just call it a "donkey"; or, for people more prone to one syllable words, "donk" (this pre-dates more modern slang meaning "badonkadonk" or the term for pimped out cars). One of us had a funny doodle of a stick figure with a giant, round penis with tiny balls, where the balls were individually drawn within the sack. This soon became known as the "balloon donk" and would, at some point, eventually grace the chalkboards in various classrooms. We'd often say "What a donk" when referring to someone that had done something foolish, irritating, dickish, etc. We made up all kinds of words (and still do) and eventually donk found it's way, through substitution, into the word ridiculous. And that was 1994 kids, before the O.C., before modern poker, before the scholars thought it was in the deep South in '97. I just saw a friggin' bumper sticker that said reDONKulous, and to be honest, I had to steer with my knee to keep my head from exploding. Don't worry about thanking me, I'm just glad the world is a funnier place.
"Missa Mirrah always giving us those redonkulous pop quizzes!" (Mr. Miller was our history teacher, and a balloon donk graced his chalkboard fo'sho'!)

"That enormous spoiler Luke put on his old, beat up Honda is redonkulous."
by Aeonium88 July 30, 2013
 
9.
something so out of control, so over the top that it takes ridiculous to the next level.
Did you see that tween dressed in head-to-toe Urban Outfitter? Totally redonkulous.

Can also be used in it's shortened form: redonx.
by jimmymontrose February 12, 2004
 
10.
1.The state of being outlandishly over-astonished by a sudden change of events that leaves the witness dumbfounded.

2. Beyond ridiculous.
Pete: "Dawg did you see that racoon slap that girls booty?"
Jake: "Man, that shits redonkulous"
Pete: "You know"
by D.C. MAN 1987 May 26, 2010
 
11.
When rediculous just isn't enough!
Becca: 'Woah, did you see that road boat'
Joliver: 'Yeah! That shit was redonkulous!'
by Joliver <3 August 19, 2010
 
12.
to define something as so ridiculous that it ascends all comprehension on the matter
that monkey flying a plane was redonkulous!
by Zach Cummins April 18, 2004
 
13.
When something surpasses being rediculous. Uterly out of hand. The next level of insane.
The outfit she wearing was redonkulous. Was her mirror broken when she got dressed?
by @michaelmadd June 19, 2011
 
14.
When something is so outrageously stupid, The word ridiculous just cannot cut it.
Oh my god getting naked in a betting shop infront of an old woman! Thats redonkulous!!
by swaggerlikeusJH March 30, 2011