The Word "Redonkulous" is Redonkulous

I think I heard this word for the first time on How I Met Your Mother. I immediately googled it and found this definition from urban dictionary: "significantly more absurd than ridiculous to an almost impossible extreme; without possibility of serious consideration." I don't understand the need for this word. I despise this word. It's nails on a chalkboard. Making up words for no apparent reason should not be a hobby!