Yikes is an exclamation people use when they're startled, surprised by something unpleasant, or reacting to an awkward or uncomfortable situation. It's the sound you might make when you realize you forgot your homework at home, or when you see someone trip and spill their lunch tray in the cafeteria.

The word captures that instant feeling of “oh no” or “that's not good.” If your friend tells you they have three tests tomorrow and didn't study for any of them, you might respond with “Yikes!” When you're telling a story and mention something embarrassing that happened, your listener might say “Yikes” to show they understand how uncomfortable that must have been.

Yikes is milder and more informal than words like “horrifying” or “terrible.” It's not for true emergencies or serious dangers. Instead, it's for those everyday moments of surprise, mild alarm, or secondhand embarrassment. You might say it when you barely avoid stepping in a puddle, when you hear about a difficult assignment, or when someone shares a cringe-worthy story. The word perfectly captures that universal reaction of recoiling slightly from something unpleasant or awkward.