A reference to sex. or the act of sex. Or, you could just be talking about eating pound cake. =
"So what did you do last night?"

"I went out with Teddy."

"Oh really? What did you do?"

"Well, I pounded her cake and she pounded mine."

"You guys had sex?!"

"Yeah, we were pound cakin'."
by Nyla Sparks April 3, 2010
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When two or more distinguished gentlemen convene to to indulge in the vast pleasure that occurs when their ass cheeks French kiss. Can also be known as, but not limited to dude ass or butcheek scissoring. Similar to the brown starfish suckle.
Peter: “How did Tyler catch colitis?”

Jon Morgado: “I heard he was Pound Cakin’ with Mathew!”
by Ernest Hemorrhaging December 30, 2022
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when a man/woman cupcakes a person of the opposite sex who is over weight.
Yo, check out Ronald, he Pound Cakin' that big girl. Big Girls need to be Cup Caked too.
by dattebayo Danttebayo June 14, 2010
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