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The act of finishing then stopping the climax.
"dude earlier i was chulking and it felt so good."
To tie a rope to one's penis, and then to run as fast as possible in the other direction.
By doing this action you can lengthen one's penis.
Dude Jonny has such a large cock after chulking for an hour a day.
When a person who's name begins with "Ch" gets very angry they get bigger and beiger and slipperier.
"You wouldn't like me when I'm angry, I turn into the incredible Chulk' - Charlie