Someone who's a
perfectly smooth bastard no matter which way you look at him.
Also works with Spherical nutjob, spherical jackass.
Syntax: Spherical cuss-word
History: Often attributed to the eccentric Swiss
Astronomer Fritz Zwicky, who used to refer to fellow astronomers at the Mt. Wilson
Observatory as Spherical Bastards. "Because", in his words, "they were bastards, when looked at from any side".
Source: dynamical-systems.org/zwicky/Zwicky-e.html