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jizz mountain 

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!
jizz mountain by Bob's porno shop February 9, 2008

Jizzback Mountain 

When one finishes on the sexual oppositions back and then leave due to them not putting out.
Did you hear about charlie, Abbie didnt put out to he gave her the O' Jizzback Mountain.