Having the proportions or appearance of a Yeti. Unusually large, obese, hirsute or aesthetically displeasing.

When you eat dirt for the first time and leave your family to build a shack in the woods

After walking thru my local town centre today, teeming with large obese people, I spied an absolute huge specimen of the female kind, not unlike a Yeti in size and stature.

I wondered how to describe this giant being of Yeti like proportions and concluded that some one yetinous is a person, so obese and huge they are like the legendary Yeti.

And smell just as bad! can also apply this to males as well.