Combination between ridiculous and stupid. Generally used to describe something that is ridiculously stupid or stupidly ridiculous.
Jumping off of that bridge is the most ristupulous thing I've ever done.
by empee July 07, 2005
(adj.)Ridiculously stupid. Absurd, not even worthy of the term stupid or ridiculous by itself.
Jumping off a bridge, backwards, is really ristupulous.
by Joltin' Joel Johnson May 14, 2008