The word 'redicous' may have originally appeared as a phonetic rendering of the word '
ridiculous' - this seems to be the sense in how it's used. However, the 'red' start as opposed to the 'rid' beginning of '
ridiculous' suggests this isn't the whole story, and 'redicous' tends to be used by a younger, trendier group of people than the more staid, spluttery 'ridiculous'. In fact, the element of
something laughable in the older word seems to be missing in 'redicous,' replaced by a hint of anger.