a unit of macage named after the infamous Neil Patrick Harris based on the metric system. The Neil is the amount of macage it takes to get a girl, with hotness rated at 1 (out of ten), to give you her number.
13 Neils converts to about 69.89 Don Juans
" That girl took at least 70 Neils to hook up with"
" He macked a full kiloNeil to go out with her"