Phrase used to determine whether you are going to have sex or not. It assumes that to not have sex is to fail the conquest.
Are you going to nail or fail with that girl your talking to.
by Ptownuk January 26, 2010
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1) A damn ugly nail art design, usually done without skill or thought.
2) (nail failer) An amateur nail artist who usually makes bad nail art.
1) Damn Melanie, did a lizard take a shit on your nails? What a nail fail!

2) Sara, your nails fucking suck balls. You are such a nail failer, just do my eyes a favor and stop making nail art.
by Ifailedatlife October 25, 2015
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