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2.
(adj.)(adv.) Extremely Ridiculous, absurd, or irrational. characteristic of insanity or complete nonsense.

The movie Spaceballs is Ludicrous.
Sandurz: Yes, sir. Prepare ship for light speed.

Dark Helmet: No, no, no, light speed is too slow.

Sandurz: Light speed, too slow?

Dark Helmet: Yes, we're gonna have to go right to... ludicrous speed.

*gasp*

Sandurz: Ludicrous speed?!? Sir, we've never gone that fast before. I don't know if this ship can take it.

Helmet: What's the matter, Colonel Sandurz, chicken?

Sandurz: *into intercom* Prepare ship... prepare ship for ludicrous speed. Fasten all seat belts, seal all entrances and exits, close all shops in the mall, cancel the 3-ring circus, secure all animals in the zoo....

Dark Helmet: *taking the intercom* Gimme that you petty excuse for an officer.

*Sandurz sits down and buckles up frantically*

Dark Helmet: *into intercom* Now hear this, ludicrous speed....

Sandurz: Sir, hadn't you better buckle up.

Dark Helmet: Aah, buckle this... *shouts into intercom* Ludicrous speed, Go!

*Spaceball-One takes off past Light Speed and Ridiculous Speed and goes to Ludicrous Speed*
by Cunjo November 15, 2004
 
1.
What the majority considers absurd or irrational.
If say an exotic dancer, currently employed in a gentlemen's club, were to bring a legal suit against a customer on the grounds of "sexual harassment", that would be considered to be ludicrous.
by nethcev! April 28, 2004
 
3.
The final level in Unreal Tournament 2004 after massacring a ton of people in a short amount of time.
Wow that was wierd! After I crushed 25 people in a row the screen suddenly said:

L U D I C R O U S
by Passm June 05, 2005