The alarmingly common misspelling of ridiculous.

v.
To diculous again

a redhead who's ridiculously hot

The intentional misspelling of "ridiculous" for someone of the (red) Republican party.

Intentional mispronunciation of "ridiculous" (based on the common misspelling) to indicate that something is ridiculous while also insinuating that somebody involved is stupid (i.e. implying that they are just as stupid as people who misspell "ridiculous").

Normally used, in the streets or urban culture, to define something (usually a song) that was amazingly good.

The correct spelling of ridiculous.