When you are not invited to a birthday party because you are lame.
Did Nick get invited to that hot girl's birthday party?

Nah, he took her on a lame date so she gave him the Birthday Shaft!
by randy2.0 October 23, 2009
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When the only present you give the birthday girl is your birthday dick. Happy Birthday.
Girl, you're about to get birthday shaft for a present.
by Totally not Bill July 24, 2016
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