An exclamation of surprise, fear, or disgust (see eww ick). Predominantly used by Latinos, especially Caribbean Latinos. Can also be used to replace the word weird. Pronounced "oo-ee". Sounds similar to the Australian oi or Jewish oy, but with a "u" sound rather than an "o" sound.
(e.g. #1) "Oh my God, Carlos, you have 12 toes! Uy!"
(e.g. #2) "Uy, roaches freak me out!"
(e.g. #3) "You expect me to go on that roller coaster? Uy, no! You must be outta your mind!"
Somebody that does something annoying and makes u hate them for no apparent reason. Such as a weird face or a particular catch phrase. Some people might think the "wazzzaaaa" thing from scary movie is "uy."
"I hate when that lady comes in, she always does something uy."