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
tight–assed
play \ˈtīt-ˌast\ adjective Like the schoolteachers who had tormented their childhoods, earnest and tight-assed, humorless and self-righteous. — Robert StoneRead the Latest from M-W
First Known Use of tight–ass
1971
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