A combination between ridiculous and retarded normally said when someone or something says something extremely stupid. When describing someone you can either call them a reticulous person or reticularded if they are extremely retarded.
Paddy: Nah its only 22:17 Don't be Reticulous
Craig: I think the green lantern is better than batman
Summer: Dont be reticulous its just cos you have a massive gay man crush on the green lantern
Craig would be an example of a reticulous or reticularded person because his stupidity is beyond ridiculous