Kimoi

A relatively recent trend in Japanese slang is to shorten long words into two or three characters plus the inflectional ending i and make new i adjectives. For example

Abbreviation	Original	Meaning
kimoi	kimochi warui	feel bad/unpleasant
muzui	muzukashii	difficult
uzai	urusai	noisy, aggressive, bossy
mendoi	mendō kusai	troublesome
omoroi	omoshiroi	interesting

See also abbreviated and contracted words