The hermetic profession of sucking one's own penis.
Nobody in the history of man has reported being able to perform this almost mystical feat because the few percentage of the world population who actually can perform autofellatio never leave their houses. However diaries and memoirs have been found, post-mortem.
Guy 1: Hey I haven't seen John lately, have you?
Guy 2: Haven't you heard? He discovered he could perform autofellatio and dropped out of school to move to a trailer park.
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