is it "Whamdango!" or "wamdango!"?

[SensiiMiller 29]

And is there a reason no one referenced "Wango Tango"?

[Dan Telfer 266]

Clearly there is an H.

[aelfinn 27]

WHAM!

[ÚncleƊracula 40]

I am familiar with the wizard spell whamdango, but what the hell is a "magic missile" ? everyone kept mentioning it.