absolute unit

noun3

1. •
   (UK, Australia) An exceptionally large or stout person.

   • Liverpool BMX president Neil Cameron said, despite the name, [Kama Kazi] is a "lovely bloke", "great with the kids" and also an "absolute unit". — 2006
2. •
   Anything exceptionally large for its type.
3. •
   A unit of measurement that can be defined in terms of mass, length, and time.