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1.
A tool, albeit one that uses girls rather than being used by them. A douche; leads girls on; heart breaker; hypocritical; believes that he's "different" and "respectful to women" when he's one of the worst to them.
Audrey: He dumped her for her best friend, then broke her heart for some underage girl who offered him sex.
Shelley: He's such a fucking nailgun, doing all of that and still claiming that he's soo nice to women.
Audrey: I know, right?
by Shelleyyyyyy December 26, 2010
 
2.
Sex when one or both partners have a gun held to their head by the other partner.
Nailgunnin' on a friday night, ALRIGHT!
by Herschel Quintron December 29, 2003