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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
 
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
 
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