intr.v. rois·tered, rois·ter·ing, rois·ters 1. To engage in boisterous merrymaking; revel noisily. 2. To behave in a blustering manner; swagger. [From obsolete roister, roisterer, probably from Old French rustre, ruffian, alteration of ruste, from Latin rūsticus, rustic; see RUSTIC.] roister·er n. roister·ous adj. roister·ous·ly adv. |
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