grass? That's a new one for me :-)

http://dictionary.cambridge.org/ru/%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D1%80%D1%8C/%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%B8%D0%B9/grass-on-sb

http://www.definitions.net/definition/grass%20on

Is it never used?

I don't pretend to be the end-all be-all of English, but I've never heard it. So I looked it up on ngrams and got the following results: https://books.google.com/ngrams/graph?content=told+on+me%2Cratted+on+me%2Cgrassed+on+me&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Ctold%20on%20me%3B%2Cc0%3B.t1%3B%2Cratted%20on%20me%3B%2Cc0%3B.t1%3B%2Cgrassed%20on%20me%3B%2Cc0

All right, clear, thanks!

👍🏼