1 definition by South Illinois

Top Definition
A phrase taken from the Mel Brooks movie Spaceballs, refers to anything happening or moving at an exceptional rate.
My computer bluescreened the night before my paper was due, so I had to retype it at ludicrous speed that morning.

I had to drive at ludicrous speed to get to work on time after I lost my keys.
by South Illinois December 28, 2010

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