roister v.

"bluster, swagger, be bold, noisy, vaunting, or turbulent," 1580s, from an obsolete noun roister "noisy, uncontrollable bully" (1550s, displaced or lost when roisterer began to be used, by 1745; Johnson still has roister as the main form of the noun), from French ruistre "ruffian," from Old French ruiste "boorish, gross, uncouth," from Latin rusticus "rough, coarse, awkward," literally "of the country" (see rustic (adj.)). Ralph Royster-Doyster is the title and lead character of what is or was sometimes called the first English comedy (Nicholas Udall, 1555). Related: Roistered; roistering; riosterous; roisterously.