Defined by gen Z. When you had threesome but only one condom to spare. After some with 1st partner, you recycled your used condom by flipping the inside out and used it on the 2nd partner.
Girl 1 and 2: Hey Josh, do you want to come over us?
Male: I only have one condom left.
Girl 1 and 2: It's ok, you can do the riverside ralicap with it.