Tverdun
A term commonly used in plast. Originally used to describe an old fallen tree log, but has recently gained the definition of a boner.
Andrey: Oh man, don’t look at Stephan right now
Ruslan: oh why not man?
Andrey: he’s got a real bad tverdun
Ruslan: oh why not man?
Andrey: he’s got a real bad tverdun