Well, as far as I'm concerned this could be similar to "homebrew twang".
After drinking and brewing beers for over 40 years, I haven't the remotest clue what either of these "things" are.
I regularly hop my beers with (for 25l) 100g of late addition and another 100g of dry hops. To me, they taste like hops. OK, at this hopping level I'm talking Amarillo, Simcoe, Mosaic, Motueka, Citra.... But I also brew what I think are rather hoppy "Trad English" beers, so I use EKG or Fuggle. Lots of them.
I've never tasted a beer that I thought was "grassy". Could be a shame - I love the smell of freshly-mown grass, and I could imagine it really going well with a light-bodied beer.