There are some abstract units of measurement that are easier to comprehend than their real counterparts. For example, Kanye is totally right. A shit load is a great unit of measurement. If you told me you had a shit load of dirt to haul, I'd know exactly what you meant. If you told me you had ten kilograms, I'd have no idea what you were talking about and assume that you meant cocaine. Anytime someone says "kilos" i immediately think of sweet, sweet cocaine.
A shit ton is obviously bigger than a shit load, but a piss ton is smaller than both a shit load and a shit ton. Someone should write a book about all of these. Who would be good for that? I'd say either me or Kanye. Hell, we could write it together.