Euphemism for having sex. The expression came about because the sound made while nailing a towel rack sounds a lot like the sound of a headboard banging against the wall during sex. Also, see "nail."
Yeah, he wasn't the best husband in the world, but he sure could nail a towel rack.
the nail you use to do that good stuff,
usually your pinky, the nail is usually longer than
the rest so you can pick up that fine powder and do it to it ;)
person 1;ew,your pinkynail is LONGG D:
person 2:it's my coke nail,bitch.