multiple insertions into an orifice similar to candles in a birthday cake
Justin and Rick enjoyed birthday caking Ian all night long
by hobodragon September 1, 2007
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Well, From What Snoop Dogg Says, It Means butt, booty
"But you can't fake once you hit the gate
Shake 'till it ache, work that birthday cake."
- Step Yo Game Up, Snoop Dogg
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Having sex with a girl from behind, and finishing on her ass. After you've finished you use a rubber spatula to evenly distribute the cum on her butt cheeks, as if it were icing on a cake. When this is complete you may stick a candle in her butt hole and light it. Finish off by putting on a birthday party hat and you have successfully completed The Birthday Cake.
"Dude, I gave Steph the birthday cake last night!"

"Oh that's nice of you dude, was it red velvet or...?"

"No dude, I came on her butt and smeared it with a spatula."
by B Hayes April 15, 2013
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When we got back to Wendy's place, she stripped to her birthday suit and I put some whipped cream on her birthday cake and ate it. Tasty, too. :)
by republican horndog :-p August 4, 2005
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When a stripper at a bachelor party attaches on her nipples & vagina, a lit birthday candle, where then the bachelor has to blow them out.
A stripper at our hotel room had a bachelor blow out a birthday cake.
by Charlie Frown September 2, 2012
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Like a cream pie, except the woman is not on any birth control, so the cream pie turns into a birthday cake, ie: she gets pregnant.
Man: Oh man, i came in my girlfriend last night, and shes not on the pill!
Friend: Oh Dude! You gave her a birthday cake!
by Chris And Libby February 18, 2009
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