slang, v. t.
  1. To hit a target. "Suzy nailed John upside the head with her frisbee." Cf. whack.
  2. To succeed. "John studied hard and nailed the test questions." Cf. ace.
  3. To have sex.* "Has John nailed Suzy yet?"
  4. To apprehend. "Suzy's sting operation nailed John for soliciting sex with a minor." Cf. nab.

* The derivation, likely from the usage of nail as "to pierce (with a nail)," would imply that this sexual term applies solely to the piercer, not the piercee.