Reverse Cowgirl is a sexual position in which the receiver straddles their laying partner, and, unlike Cowgirl position, faces away from them. Like any receiver-on-top position, Reverse Cowgirl gives the receiver control of the extent and duration of penetration.
To get into this sex position, the penetrating partner lays flat on a supportive surface. The receiving partner squats down, on top of the penetrating partner, facing the penetrating partner's feet. The receiving partner can then experiment with leaning forwards and backwards to find the best angle to hit their innermost spot.
This position is also called reverse rider on top. If this position is used for anal, some people may call it Reverse Cowgirl Anal.