Felting

Felting, an evolution from jelqing, is when a person, after learning to conduct oral on himself, will twist the tip 180 degrees before blowing into it. This will thicken the cock and it's tip, creating a felt tip penis. Felt, felting, felts, felted, felter, and feltee are all ways of referencing the exercise and those who perform it.

It is supposed to hurt this much after felting?
It's a sign you have been thoroughly felted.