According to Spike Lee, from his Bad 25 documentary, "Shamone" "isn't just a cool way to say "come on," but MJ's tribute to soul singer Mavis Staples, who used it in a live version of "I'll Take You There" in 1975."
A human-like being with a God-Like presence, a pharoah persona, and the sexual blessing of pleasuring all females he encounters. Many refer to this being as a King Dingo (the ultimate being King Ding-a-Ling).
Shamone comes from the Michael Jackson song "Bad" released in 1987. It is a distinctive deliberate mispronunciation of "come on" used frequently by Jackson, occasionally spelt "cha'mone", "jamone" or more commonly "shamone".
Today shamone can be used pretty much the same way "word" is commonly used.
One who is above all others, can kick anyone's ass. He/She is a general beast whom all like. Ass schmoner, however, can also be used as an insult, implying that you ruin everythingin the room, much like an ass will create a fart to ruin everything in a room.
Insult : "YOU ASS SCHMONER!"
(usually in a German accent)