1. underhanded and otherwise despicable behavior
He achieved new levels of scumbaggery by fucking his secretary while his wife was dying of a particularly aggressive form of small cell cancer that metasticized on her ovaries.
A deceiving, manipulative way of conduction sales calls/ or servicing an account.
Ace and Slomar have become masters of scumbaggery.
When someone sleeps with a person of decisive power in order to make a sale.