The Collaborative International Dictionary of English v.0.48:

Roister \Roist"er\, v. i. [Probably fr. F. rustre boor, a clown,
   clownish, fr. L. rustucus rustic. See Rustic.]
   To bluster; to swagger; to bully; to be bold, noisy,
   vaunting, or turbulent.
   [1913 Webster]

         I have a roisting challenge sent amongst
         The dull and factious nobles of the Greeks. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Roister \Roist"er\, n.
   See Roisterer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

roister
    v 1: engage in boisterous, drunken merrymaking; "They were out
         carousing last night" [syn: carouse, roister, riot]