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2.
The name of a burger unlike any other, famous in Portland Oregon.

It's a grilled cheese sandwhich for one bun, a 1/4lb angus beef patty, egg, bacon, ham, spam, the extras (lettuce tomato etc), and another grilled cheese sandwhich for the top bun.
You: Dude, that is the most redonkulous burger I've ever seen?!

Me: Yea, its the Redonkadonk.
by JackieStan June 04, 2010
 
1.
Ridiculous. A word that, when used by the right people, is hilarious.
Jane's new hair cut is redonkadonk
by Tuesday Valentine August 07, 2005
 
3.
Otherwise the formal spelling of, redonkadonk, is derived from both redonkulous and badonkadonk; hence coupling verbal and visual absurdity together in order to portray something (emotionally and/or physically) unfathomably disturbing, amazing, or - in many cases - both.
Did I tell you about the time I saw Pat Robertson at a strip club getting a lapdance and screaming, "Hallelujah!!"? ...Yeah...Redonk-a-donk.
by C_Dizz February 27, 2007
 
4.
A young woman with a surprisingly large rearend.
Damn, look at that redonkadonk
by T_Lard December 20, 2007