skid stain
a stain left in someones tighty whiteys after they shit themselves
These here undy pants we found in the locker room have a MAD ASS skid stain on em
national skid stain
A person or group of people the knowingly or unknowingly embarrass their nation weather it be political, or just publicity.
Did you see those comments from gamergate, this is going to turn into another national skid stain.