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1.
The absolute highest level of Ridiculous. There are five levels of ridiculous.

Ridiculous.
Ridonkulous.
Ridonkadonk.
Ridicadonkulous.
Ridicadonkadiculous.

Ridicadonkadiculous should only be used in the rarest and most extreme of cases.
"Did you hear that they discovered Barack Obama to be an alien from Saturn, sent here to destroy Earth?"

"That's Ridicadonkadiculous!!!"
by Sammy Unreal November 10, 2008