(US, slang) A small portable toilet often used on multiday river trips in protected wilderness areas, so named because the original versions were metal boxes whose rims left a groove in the skin of the user.
“Integral hydraulic roll groover with universal motor to form standard roll grooves on steel pipe or copper.”
“The leaner, meaner compositions of the second half are more linear, particularly an unnamed Latin groover with a central riff that bears an uncanny resemblance to the Beatles' Day Tripper.”
“He then launched into his familiar club-set pattern: three long pieces, the middle one a cruising groover during which to recover his energies, book-ended by two furious thrashes.”