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A small pipe used to smoke your chronic. It comes from the latin roots "mellonious", to chill, and "phonius", to smoke.
Big Bird was a consumate user of the mellophone down on Sesame Street. (Cookie monster too; hence the munchies)

Please don't empty your mellophone in my car ashtray, my parents are very suspicious and paranoid people.
by D.W. Davis January 09, 2006
The best god damn instrument ever. Looks like a trumpet but twice its size. I myself can play double high F with Ease now. (not the high F on staff, the high octave over F) The notes are somewhat similar to the Bb Trumpet and it is in the key of F. Most girls who play it however cannot play correctly (not sexist... its just true for the most point.)
I can whale really really high notes over the staff. My highest note so far is a triple C over the High C over staff.
by Mello player August 17, 2005