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A milkbox occurs when you open a brand new box of cereal and pour the milk directly into the bag using the box and bag containing the cereal as the cereal bowl itself.
"Jessisa and Rayn shared a milkbox of lucky charms for breakfast."
milkbox by Sir Rayn Tacy November 1, 2008
Verb: when a girl is giving you a blowjob and she opens up your pee hole in the way you open up those boxed milks from elementary school and she then spits inside
Last night this girl milkboxed me now my dick burns. I think I might have a UTI.
milkbox by Cape Cod Rod March 26, 2014

Milkbox Mission 

A journey that is a waste of your time.
A pursuit resulting in failure.
"Dude sent us on a milkbox mission; we never found what we needed."

"If you're trying to get your dick wet, I'm a milkbox mission."
Milkbox Mission by Laci Jones January 21, 2009

Rusty Milkbox Ukulele 

The opposite of the Rusty Trombone, in which the recipient is female. Basically, the male (or female) licks the receiving girls asshole while fingering her.
Man, she gave me a Rusty Trombone so I had to return the favor. I spun that bitch around, got down on my knees and gave her a Rusty Milkbox Ukulele.

Rusty Milkbox Ukelele

The opposite of the Rusty Trombone, in which the recipient is female. Basically, the male (or female) licks the receiving girls asshole while fingering her.
Man, she gave me a Rusty Trombone so I had to return the favor. I spun that bitch around, got down on my knees and gave her a Rusty Milkbox Ukelele.

Milkboarding 

Milkboarding is a less common form of torture in which milk is poured over the face of an immobilized captive, thus causing the individual to experience the sensation of drowning. Milkboarding can cause extreme pain, dry drowning, damage to lungs, and several symptoms related to lack of oxygen. Symptoms can also include bad breath lasting several weeks or even months, as a result of milk decomposing in the lungs.

Milkboarding is being used in parts of the fitness industry (the strong parts) as punishment for spreading stupidity.

Traditionally, whole milk is used for the torture. In rare cases, whole milk with added cream is used. The added cream increases the amount of fat in the milk, resulting in a higher level of oxygen restriction.

Although milkboarding has several similarities to waterboarding, the use of milkboarding is mainly for punishment, not as means to retrieve information.
"If that skinny vegan keeps saying meat is unhealthy, I'm gonna f**king milkboard him."

"That lazy fatass stopped badmouthing squatting after he was milkboarded."

"Gym Rule: Curling in the squat-rack is punished by milkboarding until consciousness is lost."
Milkboarding by Melkemannen September 4, 2012