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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
wangnail by millville resident April 2, 2009
Related Words

Wangpail 

When you impale someone with your wang. Ex: wanging, wangpailed, pailed, etc.
guy 1: dude andre fucked the shit outa that girl.

guy 2: yeah I know dude he totally wangpailed her.
Wangpail by mightyman November 13, 2011