Fake Breasts

Calling for the front seat in the car, see shotgun

Half circle pencil markings in the writing utensil slot on a desk. Students fill in the sides of utensil slots on desks throughout schools with their pencil, creating what is known as a milk dud. After finishing a milk dud, students will typically erase them, but in many cases they're left behind for other students to continue the milk duds, shading in the entire pencil slot.

after having sex
twisting the womens nipples

The phrase "milk DUD" is a lesser known term for bro, because of bros pronunciation of the word "Dude". The bros are so over-whelmed with their broness, they feel the need to pronounce the word "Dude" like the word "Dud", we get "milk DUD" because it just sounds like it makes sense.

When your man puts chocolate on your titties and calls it a milkdud.