Definition of "grassie"

The one thing I didn’t want to do was spook [sic] a grassie by hastily walking down the sidewalk.

2010, Jeff Currier, “Not All Carp Species are Equal”, in JeffCurrier.com‎, archived from the original on 2014 April 27

my pattern is a lot less glamorous, which is also why i think the grassie took it

2013 December 30, Josh Cohn, Tidal Potomac Fly Rodders‎ (Usenet)