overproof
From The Oxford Companion to Spirits & Cocktails
typically refers to rum with a much higher than average alcohol content, or proof. Overproof rums are often used in small amounts in mixed drinks, or as a flammable float in flaming drinks. See flaming drinks; proof;, rum.
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).