What does "tightass" mean?

Someone who does not know how to have fun, or who is so worried about insignificant things as to ruin any fun that anyone around them may be having.

What is a synonym for "tightass"?

Common synonyms include: jitterbug, nervous wreck, worrier, worrywart.

noun, slang

noun, slang ·Moderate ·College level

Noun

1
Someone who does not know how to have fun, or who is so worried about insignificant things as to ruin any fun that anyone around them may be having. Canada, US, mildly, slang, vulgar
2
Someone who is stingy, or who is tight with money. Canada, US, mildly, slang, vulgar

Back-formation from tight-assed; equivalent to tight + ass.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.