Pugsley –
In the 1800s it was a term used to describe razzing from the fans. Somehow during WWII it became a term used to describe a pitch up under the chin. I don’t know who coined it.
The most famous pitcher in the past was Sal (the “Barber”) Maglie. His up and in would give the batter a close shave. Barbers used to shave customers with a long straight edge razor. That’s how he got his nickname.