Flutterby™! : carpe jugulum

I know we've got some Latin geeks out there who can confirm or deny this (and some Terry Pratchett fans who will be disappointed that his version isn't correct), but by way of Robin D. Laws, The Independent brings us the tale of Christopher John Frayling being granted a nighthood, with the motto:

"Perge, Scelus, Mihi Diem Perficias". The gentleman at the College translated this, quite accurately, as "Proceed, varlet, and let the day be rendered perfect for my benefit." But it sounds better in the demotic: Go ahead, punk, make my day.