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When you are in some form of a relationship with a girl, & you hook up with her best friend, and you do the dash on both of them (leave). Double Dash.
JP did the double dash o his girlfriend Natalie and her best friend Kayleen.
by aawigwig August 13, 2018
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2
1. Double penetrating a woman hard enough to induce both anal and vaginal prolapse when pulling out

2. The act of alternating thrusts between anal and vaginal sex, often inducing either anal or vaginal prolapse
Me and a friend were fucking this girl so hard, we totally double dashed her
by Cubictofu October 11, 2014
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