well,it's like an expression someone speaks it when they are amazed at something (explosion/knock-out/big house on fire,etc).
the example will explain better
go to youtube and write god damn what a rush,the video length is 11 seconds.John Travolta says it there
John Travolta says in amazement (when he saw a big nuclear explosion):God damn what a rush.
he was a bad guy and he liked the explosion
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