adj; an expression of the word "ridiculous" but to a much larger degree; often used whilst under the influence of intoxicating agents such as alcohol; used to express a range of emotions included but not limited to: being impressed, fright, awe, amusement, disgust, surprise, appreciation, basic interest in, depression, frustration and negativity
"He did a back flip with one leg?! That is redonkulous!"
"Are you really that shocked that Angela is a redonkulous crack-whore?"