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1) The enamel growth at the end of a circumsized penis that resembles a thumbnail.
2) The protective "thumbnail-like" growth at the tip of a man's penis that starts to form when the man is in his mid-twenties
Man, his WANGNAIL really protects the tip of his penis.
Or
His wangnail is as strong as adamantium, there's nothing that can trim it down
by millville resident April 02, 2009
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