Putting waffles in the toaster

Having raw/unprotected sex with someone that may be a stranger to you, or if they're just a hookup.

“I’m on my way to her house to put some waffles in the toaster, I hope she’s hungry.”

"So, what did you guys do last night?"
"Let's just say I put some waffles in the toaster."

"Where the fuck is Kyle?!"
"He's probably putting waffles in the toaster again."