Musking is when they squirt out this foul-smelling substance from their vent; it is something that wild garters will do, and that one of my friend's rat snakes did to me before.. I actually had a WC BP do it years ago too. It has to be one of the worst scents out there; I remember a garter musking me when I picked it out of our garden to take a photo; I took a shower and washed all of the clothes I was wearing and still smelled it!
For anyone that knows: ever been musked by a corn?