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A combination of retarded, dumb, and ridiculous; sometimes said as a cover for when saying "retarded" isn't okay.
"She is so redumbulous it hurts."

"Oh my god, he's so reta---uh, redumbulous!"
by Lovette Cher February 27, 2010
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When something is more then stupid, it can not be described as rediculous cause its just that dumb.
That shit wasn't crazy, it was redumbulous.
by claymenia September 25, 2009
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