It is the leaking of jizz(semen) from the asshole of man who usuaully just had anal sex.
Whoa Chad, your making a jizz mountain! The semen I just released in your ass is coming out!
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Slang for "Mountain Dew"
Can also refer to a substandard ripoff form of Mountain Dew (i.e. Citrus Drop)
"Dude grab me another Mountain Jizz from the fridge"
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