An exclamation like "jeez" is used when someone is surprised or frustrated.
When people use this word, it's usually as an expression of shock or annoyance. They might say "Jeez, I didn't mean to spill my coffee all over my shirt!" or "Jeez, I'm so tired today." It's kind of like saying "gosh" or "geez", but often in a more casual way.
Alternative spelling of geez.
