I’m an argument of why my side should win,
And worn by men for privacy.
I don’t last long if I get under your skin,
And I rhyme with a kind of misery.
What am I?
Brief (or briefs). A legal brief is a short outline of the arguments in a court case, briefs are worn by men to cover their privates. Brief also means to not last long and brief rhymes with grief, a kind of misery.