The Collaborative International Dictionary of English v.0.48:

maffick \maffick\ v. i.
   to celebrate publicly with boisterous rejoicing and hilarious
   and extravagant behavior. [Chiefly Brit.]
   [WordNet 1.5] Maffioso

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "maffick":
   be noisy, beat the drum, blow the trumpet, brawl, carry on,
   celebrate, chirm, clamor, clangor, commemorate, cut up,
   cut up rough, dress ship, fire a salute, go on, hallow,
   hell around, hold jubilee, honor, horse around, jubilate, jubilize,
   keep, make a noise, make a racket, make an uproar, make merry,
   mark, memorialize, noise, observe, racket, raise Cain,
   raise a clamor, raise hell, raise sand, raise the deuce,
   raise the devil, raise the roof, roar, roughhouse, row, rumpus,
   signalize, solemnize, solemnly mark, sound a fanfare,
   whoop it up