It means "go cut the grass". It is afrikaans...
Gaan sny die gras.
Go cut the grass.
Gaan sny nou dadelik die gras.
Go and cut the grass immediatly.
Litter: Go cut immediatly the grass.
Sny, a person that is very annoying and everytime you see him you want to get away from him. often named Stian and has a very fragile looking body.