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To thrust the penis between a women's preferably large breasts and ejaculate on her chest and/or face. can be used as a noun or a verb. (explanation for the sex-impaired: breasts contain milk, and you bone them, hence the term "milkbone")
Hey Angi, i would really like to give that large breasted lady a milkbone.

Tom really enjoys milkboning his wife, who i am told has relatively large breasts.
milkbone by ricky mixx February 13, 2013
many people use it, although usually they don't understand it.
A Milkon is a female breast (haven't you guessed already?) but where people usually get it wrong is that they interpret it in a " Milk ON" way or to say that someones tits are very arousing. BUT in truth it's a "Milkon" ergo a Milk Gallon, it is... no WAS meant as a way to say a nursing mother have too much excess milk, or in other words are neglecting their child, but sadly that definition died off around the early 1900. and when some geeky high school-er found it in an old book, he didn't bother looking it up on urban dictionary (yes it existed, its SO awesome that it breaks space-time continuums for breakfast) and decided its another word to say "OMG! HUGE BOOBS!"
Wrong way: Dude! Check out that chick, awesome milkons eh?

Right way: Oh my! Did you know (insert-a-name gap-o) has got TONS of excess milk?

-Oh my, indeed! I was wondering how she increased her breast size so much, turns out it was just a milkon case
* "high class" laugh*
^a.k.a=demoniacal
milkons by TheShadyOne April 5, 2010

milktonium 

I hope I don't over-dose on milktonium at this party tonight.
milktonium by that_be_hcook November 19, 2009

Milkionsair 

My friend told me it meant "No idea"
Apparently Liam Payne is a milkionsair
Milkionsair by Woah69420 December 9, 2020
Plump + White skin = Milkbone

Anna Nicole is a milkbone. Well was (R.I.P <3)
Milkbone by Senor K Bivins September 18, 2011
When you are with a random girl and you are doing it doggie style. Just as she comes you punch her in the tailbone.
I gave that random bitch a milkbone last night
MilkBone by humandumpster April 22, 2010