Top Definition
Sex position including one male and one female partner. The male holds the female upside-down and sideways between his legs (creating almost a scissor-like leg position) and proceeds to jump up and down while simultaneously jamming his raging boner into either her anal or vaginal crease. The result is a massive jizzbomb, hence the name.
Man, can you believe Peggy let Bill do the Upside-Down Jumping Jizzbomb to her at the Christmas exchange? I heard they even let people photograph them. I don't blame them, that is one challenging move!
by WussGoodWitIT January 22, 2011

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