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1.
When a man attempts to trim up or style his beard and makes a fatal error, forcing him to go clean shaven rather than bear the shame of failure.

Seppuku is the custom of Japanese samurai to commit ritual suicide upon suffering great dishonor or failure.
Pierre: "Hey dude, why'd you go clean shaven?"
Antoine: "Ah.. well, I made a mistake while trimming and had to commit beard seppuku."
by OtterOwnage December 12, 2009