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1.
verb. to make someone dissapear usually by killing them.
keep pressing me and im gonna milkbox that ass.
by $PAZZ April 01, 2003
 
2.
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.
by Cape Cod Rod March 09, 2014
 
3.
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."
by Sir Rayn Tacy September 18, 2008