coup de grass

Da final status of an argument from a teenager about not wanting to mow da lawn.

If yer parents decide to have ya do a little yard-work, ya should know right off da bat dat it's not gonna do any good to whine or protest about it --- it'll always be da "coup de grass" --- i.e., ya'll still hafta do said landscaping in da end, no matter how loudly ya wail about it.