MJR0 Share definition Flag MJR0 is an acronym for (major jizz running out) of someones mouth i left that cocksucker with MJR0 and it was really messy all over her shirt. MJR0 by supermann694eva November 13, 2011 0 0 Get merch Get the MJR0 mug. Buy Now — $32.95 See more merch