Novice: When I first examined him I felt oddly unwell. I would never have expected such a well presented gentleman to have posterior funk.
Senior: I think you mean posterior flank!
To look surreptitiously and luridly at the hindquarters of a member of the appropriate sex from a distance, especially as practiced by statisticians, mathematicians, etc.
When they brought those due diligence chicks in for our 1 o'clock feeding, I was caught doing a posterior analysis on the asian one with the houndstooth skirt. Man I was embarassed.