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1.
the weekend you get your fake id. drinking and debauchery abound. anything goes. once it happens, you never stop experiencing the aftermath, good or bad.
My friend hooked up with a bunch of guys during birthday weekend; that week he found out he had herpes.

On birthday weekend, I saw two girls making out in front of me at a bar; then my friend's wallet got stolen at the bar.
by schwasted123 March 06, 2011
 
2.
The first weekend after one's birthday when one has a birthday during the work week. This is the time when most activities planned for celebration occur.
I can't fucking wait until my birthday weekend so I can get drunk.

Oh shit! That's happening on my birthday weekend. Perfect excuse to go!
by Andrew "Party Hard" W.K. January 20, 2010