Stovepipe
A malfunction where a spent case is caught in the ejection port, sticking up like a stovepipe.
A stovepipe is a vertical spent case wedged in the ejection port — usually caused by a weak grip (limp-wristing), under-powered ammo, or a failing extractor. Clearance is fast: sweep the case away with the support hand or rack the slide while pointing the muzzle downrange. Practice with snap caps or dummy rounds.