Like an Old Man Collecting Barbie （きもい）

He Says:
kimoi　（きもい）=disgusting
Young japanese love to use this word to disgusting people or things.
Originally kimoi was got shorted of KImochiwaruI(=disgusting).
Young japanese love to get shorter a word,
like kimutaku=KIMUra TAKUya(japanese famous celebrity name),
pasokon=PErsonal COMputer,
kombini=CONVENIence store.
So young japanese would use kimoi, like when a old guy collects so many barbie dolls or something.
Variations:
Kimo!
Kimo~!
Kimoi!
Kimochi warui!
(all with a frown face,like ugh,blech face)

She Says:
I think that a proper breakdown of how the meaning of the word will help you get a better sense of when you should use it. Kimochii means "feeling" and warui means "bad". So literally this means "bad feeling" and it's generally used when something sort of skeeves you out on the inside...like a toenail that's about to fall off.

The next word is...へたれ。