The anniversary of the day you were diagnosed or infected with HIV.
On Harry's Dirty Birthday, we're going to break into his apartment and dirty up the place a bit for him.
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When the guy is about to cum, the girl blows the jizz as it comes out as far as she can.
at my birthday party last night, that girl dirty birthday candled me ;)
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someone who says it is their birthday when it is indeed not their birthday at all
Aly: So when's your birthday grandma?
Grandma: Today!
5 minutes later
Aly: YOU DIRTY BIRTHDAY LIAR! TOMORROW IS YOUR BIRTHDAY!
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(Adj.) A personal description related to the whorish or slutty acts willing to be performed for one's partner only on their birthday, birthday-only acts being more extreme than everyday acts.
1. Your mom is beyond nasty - she's birthday dirty. She frightened me a little last night...
2. My ex was a little drunk last night, so I figured why not get birthday dirty for a little while...
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When you are having anal sex with someone and they fart and it feels like your dick is being blown up like an animal balloon. Similar to jet wash
This chick last night gave me a dirty birthday clown and all morning my whiz has been sputtering, but the jet wash felt great on my balls.