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the "creamy filling" of your "man twinkie;" you know, jizz!
Women are evil cuz they try to steal your man juice!
Man Juice by Da Nasty One June 17, 2003
Refering to sperm from a man.
Then I put a load of man-juice in her hair! Right on!
Man-juice by Le Buk Sportif^ December 23, 2003
The noun form of ejaculate, or simply semen.
man juice by Stick January 20, 2003

let loose the man juice 

a saying for when you either jack off and cum or is about to jack off and cum.
When I was walking home from school and I didnt jerk off for like seven days I thought to myself, I cant wait to "let loose the man juice" when I get home.

Man Juice Tree 

A tree that each spring is abloom with pretty white flowers, though their scent is nothing like a flower – rather it has the distinct odor of “Man Juice” (aka semen, jizz, goo).
Dang – shut all the windows, that damn Man Juice Tree is stinking up the house!