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1.
(noun.) collective term for alcoholic beverages, used in an affectionate context and never with negative connotations.
Barkeep, several measures of fun juice for me and my companions. We're parched.
by Grand master suave May 30, 2011
 
2.
the process of male gential explodsion
Wow ... that kid's gotta lot of Fun juice
by Matt June 16, 2006