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1.
fucking hard. The kind of guy you wouldn't mess with under any condition, like Gary Busey in Lethal Weapon. Normally quite squat, very powerfully built. People who are Nails shirk off car/plane crashes as if they have grazed their knee. Crazy russians who wrestle bears are nails.
faaaaking ell.. large Larry took aht 20 cozzers before they got the cuffs on im... then he chewed off 'is own aaand to escape. E's fucking nails I tell yah.
by chavspotting April 30, 2004
 
2.
verb: to penetrate with penis

verb: to screw financially
1. I nailed her 3 times last night.

2. She really nailed me in the divorce settlement, I lost almost everything of value to her lawyer.
by Jake March 06, 2004
 
3.
adj. A shortened form of the phrase "tough as nails". Applies to one who is mentally/physically strong.
"He kept his composure despite a string of bad luck and untimely errors. He was nails."
by razorsharp84 September 08, 2005
 
4.
To fuck.
Mang, I nailed that bitch to the wall.
by bobby March 14, 2003
 
5.
VERB: 1. To Win; To thoroughly accomplish a given task with pin-point accuracy. 2. To score sexually with a member of the opposite sex; to engage in the act of intercourse.
1. Kobe nailed that last shot. 2. She was nailed more times in one night than Jesus was to the cross.
by Flyin' Squirrel February 19, 2004
 
6.
A very rought type of, usually, male individual.

Nothing in particular, except the person is usually known to cause pain or to be able to handle what others would call intense amounts of it.

They often drink beer, smoke cigarrettes, and go out with sexy girls.

True story.

My neighbor was nails, he was in a car accident where his truck rolled many times without a seatbelt. He got out to smoke a cigarrette, and went and stood by the drunk man that hit him, communicating, with the man missing bodily parts and expelling massive quantities of fluid.

Only someone nails would endure such an occurance unscathed.
by ate July 17, 2006
 
7.
To have sex with or engage in intercourse w/ someone.
He hoped to nail her after the Junior-Senior Prom.
by Christina April 15, 2003