"American shit"
Is used by most Germans to insult the way Americans do things.
such as, you may have heard the phrase

"Whats this American tv shit?"

such as when Animal face off hit animal planets tv network.

"What a kind of american TV shit....
A caribian marine shark from vs a hippo from Africa.

*with animation of them fighting*
the following comment was added
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A freshwater african hippo visit a caribian marine shark!

Must live in AMERICA to believe, that the world is so small and simple! "
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Al tho its not just the Germans who post statements like this.
it is also the middle east,Poland,Netherlands,iraq,china,Vietnam,Argentina, and partly the United Kingdom

The term is most used when something incredibly stupid is done by a American.

A cryptocurrency of little to no value, usually a late-comer to the Bitcoin craze, a copycat cryptocurrency.

this is all kind of things that come from america like some movies.