MUMZERT Share definition Flag To insert your penis into an orifice for one stroke, ejaculate then not pull out for fear of abandonment. The sex was blah he could only mumzert me then proceeded to fall asleep. MUMZERT by Ranchgirls September 17, 2020 0 0 Get merch Get the MUMZERT mug. Buy Now — $32.95 See more merch