invented word from "Captain Marvel" comics, 1940.
Beside that man is yet another Trinidadian, widely identified as shazam Mohammed.
An exclamation of triumphant and delighted announcement, emphasis, etc: SHAZAM! He was up on the table/ Go ahead and say it, Shazam!, juice it up
[1940+; fr the operative or command word of a magician, similar to presto change-o]