Definition of "groover"

"Saturday Groovers" relishes in smelling "the smoke from the lungs of the Saturday groovers" with jubilant, T. Rex-like swagger, then situates the reminiscence in a present fraught with "heart disease and gout." "

2009 February 17, “CD REVIEWS”, in Toronto Star‎

However, the title track is a total groover about the mass media's pimping of punk rock.

1998, Maximum Rocknroll, number 181

It [ore] is generally cloathed with a substance which the groovers call Crootes, and is a soft, mealy, white stone

1772, The Lady's Magazine

During an early river trip back in the 1970s, shortly after this system was developed, the toilet seat was accidentally left behind, the rims of the riser left telltale indentations on everyone's bums, and the box got a nickname: the groover. (Some guides also call it the duker or the unit.)

2008 July 7, Kevin Fedarko, “They Call Me Groover Boy”, in Outside‎

On the river, the matter of poop is taken care of by a "groover." Nothing special, the groover is a toilet seat set atop a military-surplus ammunition can with a special liner. So named for the days before rafters discovered they could place a toilet seat atop the ammo can and instead sat on the edges of the box, leaving grooves on their hindquarters—the groover is an effective, and enjoyable, way to crap in the woods.Some referred to the toilet as the "groover" in honor of the old days when there had been no toilet seat. Instead people would sit directly on the top of the ammo can, leaving telltale grooves in their skin

2015 July 29, Colby Frazier, “River of No Return”, in Salt Lake City Weekly‎