A reference to a Simpsons episode in which Milhouse first complains about wearing his "dorky highwater shorts" but feels better when the floodwater "soaks his ankles" but leaves his cuffs "bone dry," at which point he exclaims "Alright, everythings coming up Milhouse."
Example: I was picked as the "Best Edward from Twilight Look-alike" at the Springfield Bi-Mon Sci-Fi Con. Looks like everything is coming up Milhouse.
A celebratory phrase used following one, or a series of, positive, though generallyinsignificant event(s).
Its origin can be attributed to Milhouse, a character of television show The Simpsons, who coined the phrase in jubilation after realising the success of his flood pants to keep his cuffs bone dry.