ooky

Slightly "off" or unwell; experiencing a sensation of vague physical or mental unease. Possibly derived from similar-sounding words such as "icky" or "yucky." Often used when a person feels distinctly unwell or uneasy, but cannot pinpoint the exact reason for the feeling.

1. I felt ooky after eating those raw oysters last night, and today I've got full-blown food poisoning.
2. I've been feeling a little ooky about our relationship for awhile now, but I wasn't expecting to learn my boyfriend was sleeping with three different people behind my back.