When a man inadequately shakes the drips off of his penis following urination causing his undergarments to adsorb the urine into an expansive dot causing a 'Medallion'

Can also be further classified as a 1 spot 2 spot or 3 spot. Any more than a 3 spot classifies one to have urinated themself.
For the female equivient

A Medallion is a middle aged, hard living, caucasian man. They are typically found throughout the southwest and particularly where gambling and smoking in restaurants is legal, i.e.. Tahoe, Vegas, Reno, Tucson, Phoenix. They tend to be badly weathered from the sun and shirtless wherever permitted. Their name comes from the medallions they sport around their necks, usually a memento from one of their favorite gambling towns. These are sometimes accompanied by ridiculous turquoise rings and bracelets. Medallions are all chain smokers (meth, cigarettes, crack, carpet) and heavy drinkers (thunderbird, malt liquor, box wine, everclear, paint thinner)

Medallion means brutal hero.

a fairly large, silver chain..used in ghetto gangs containing black people with bandanas. a must have in gangs.

A beautiful, puffy, pink, round set of nipples.

sitting bare assed on someones head and farting leaving a spot which is the medallion
much like baltic turban but no undies

Straight up UGLY !