1. Ignorant Anatomical (ass) Guess
A number pulled from "thin air or anatomicaly generated (pulled from ones ass)" for the purpose of screwing field personal or stimulating ones personal ego in order to overcome feelings of inadequacy.
(Accuracy 0 to 1 percent) A rapid estimate based on a degree rather than any experience at all
Before NASA existed took and I.A.G. and said "The moon is made of chease"