\ ˈtīt-ˌas 
\
\Definition of tight-ass
chiefly US slang
: a rigidly straitlaced, conventional, or inhibited person
As Indiana warmed up, Wilkerson noticed Bo Ellis, Marquette's star forward, pointing to the Hoosiers' retro warmups and laughing. Clearly, this game matched the cool dudes from Milwaukee against the tight-asses from Bloomington.— Jack McCallum
Other Words from tight-ass
tight-assed \ ˈtīt-ˌast \ adjective
\ adjective
Like the schoolteachers who had tormented their childhoods, earnest and tight-assed, humorless and self-righteous. — Robert Stone
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Time Traveler for tight-ass
The first known use of tight-ass was in 1971
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