The McJeffrey Share definition Flag To find the ugliest girl, that you will ever see and take a piss on her butt cheeks and then insert your penis into her ass. That girl was so ugly I had to give her The McJeffrey. The McJeffrey by Nascar October 1, 2014 0 0 Get merch Get the The McJeffrey mug. Buy Now — $32.95 See more merch