The tightening to various degrees of the anal sphincter as a result of engaging in various acts of terror or daring. Often the use of a scale from 1 to 10 is applied to the term. A value of 1 is low and a value of 10 usually requires death or extreme disfigurement.
Definitions include: Pucker- A word of Anglo-Indian (Hindi) origin. Defined by the Concise Oxford Dictionary as "genuine; of good quality, reliable; of full weight". This is a British slang definition of the original word.