Also see happy meal.
Whilst receiving deep-throat fellatio from a woman, one may stuff one's ballsack into the woman's mouth at the same time, the sheer volume of which causes her lips and cheeks to stretch wide open (as though she's making a big happy smile, hence it is sometimes referred to as a happy meal.)
Man, look at the mouf on that chick... I'll bet she'd love a nice Sausage Egg McStuffin for breakfast.
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