"Soshoku danshi" is literally "grass-eating (herbivore) man". "Soshoku-kei danshi" is "grass-eating-group man". The latter is slightly more correct, but both

"Soshoku danshi" is literally "grass-eating (herbivore) man". "Soshoku-kei danshi" is "grass-eating-group man". The latter is slightly more correct, but both are in common use.