uproariously

from WordNet (r) 3.0 (2006)

uproariously
    adv 1: in a hilarious manner; "hilariously funny" [syn:
           {hilariously}, {uproariously}]

from The Collaborative International Dictionary of English v.0.48

Uproarious \Up*roar"i*ous\, a.
   Making, or accompanied by, uproar, or noise and tumult; as,
   uproarious merriment.
   [1913 Webster] -- {Up*roar"i*ous*ly}, adv. --
   {Up*roar"i*ous*ness}, n.
   [1913 Webster]