When a woman is so unsatisfied with a man's sexual performance, she taps him on the shoulder, indicating that she's tired and just wants to go to bed.
Popularized by Seinfeld
I can't believe it! I really thought I was zone, but then she gave me the tap.
When someone hears metal so amazing that they simply can't contain a boner.
Dude, have you heard the album by Wintersun? I'm getting a metal boner just thinking about it!