Muffin Milkshake

When a person wears pants tight enough to create a "muffin top" and a man fucks the folds of the "muffin top", ejaculating between the folds. Continuing or movement after causes the semen to become frothy and creamy, similar to a milkshake.

"Have you ever had a muffin milkshake?"
"Dude, I gave Alexa a muffin milkshake last night!"