Second-Hand Mayonnaise

Excess mayonnaise that has been wiped from a butter knife to the edge of the mayonnaise jar.

"I can't reach the bottom of this jar, but the second-hand mayonnaise at the top has bread crumbs in it."

Mayonnaise Hands

After you eat a jar of mayonnaise with your bare hands and your hands are sticky and it looks and feels like you came on your hands.

Brad: Yo I shook Chad's hand and it felt like there was cum on it
Jacob: No I think he just has mayonnaise hands.