cup o nails
a container full of roofing nails, generously distributed on some bastards driveway who has wronged you somehow in the art od road etiquette.
"that fucker cut me off so I follwed him and found where he lives. This morning, I filled my empty coffee cup with a handfull of 1 1/4" roofin nails and flung it in his drive.Hope he enjoys a hot, cup o nails!