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Having the proportions or appearance of a Yeti. Unusually large, obese, hirsute or aesthetically displeasing.
The foul-mannered yetinous woman I had the misfortune to sit next to devoured two Big Macs, fries and Coke, a large packet of crisps and two king-sized Mars Bars in the space of five minutes.
by Der Polizei Grammatik October 31, 2007
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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.
'Look at that yetinous bitch, I bet she can't keep her head out of the fridge.'
by Freshmans October 31, 2007
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(adj) someone who is so overweight that gargantuan isn't quite enough
"This woman was of Yeti-like dimensions and at that point my dilemma was arrived upon. How to describe such a titanic mass of adipose tissue and angry stretch marks?? Yes, I think Yetinous is the one for me"
by baldmosher October 31, 2007
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