Funny. Never heard this before!
In the UK the term "grass" (snitch) comes from London cockney rythming slang.
"grasshopper" was the term for a copper (police officer)
That's where "grass" came from.
Dont talk to him he's a grasshopper! 
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You learn something new everyday!
End of conversation
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He folded quicker than superman on laundry day.
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