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1. A believer of the church of Yongsoo, a religious group adhering to the belief that copulation with oneself is the purpose of life
2. One who over enjoys sexual stimulation of the penis
3. One who enjoys watching others have sexual intercourse (usually by means of stalking) while masturbating rapidly with one's hands
Dude, that guy is a Yongsooist! Lily stay away from him! Not only does he wear tight pants with a perpetual bulge accompanied by a pungent stench that permeates the air, he attends the church of Yongsoo!
by Vincent the Great August 16, 2007
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