Meaning: someone who's repressed and very strict about following society's rules
- Don't be such a tight-ass, Rob. Let yourself have some fun for a change.
- Our teacher is a real tight-ass. We never do anything fun in class.
Origin: possibly originated as a combination of "up tight" and "ass" or "asshole"
Variety: This is typically used in American English but may be used in other varieties of English too.
A person who's often called a "tight-ass" is probably
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Contributor: Matt Errey