Definitions

1. noun

an unpleasant or unimpressive person, especially a man; a nobody

“He’s just a schmo who can’t even take care of himself.”

2. noun

a person who is seen as unimpressive or lacking in ability

“The company’s CEO is just a schmo who doesn’t know what he’s doing.”

3. interjection

used to express disgust, disappointment, or annoyance

“Ugh, schmo! What a terrible movie!”