A method of hitting on an elderly woman, but can appropriately be applied to all ages in equestrian circles. Used correctly, it implies an ambiguous but unequivocally certain sexual act.
The act of one being in side saddle or little spoon position and reaching behind the back with the right hand similar to a French butler would while holding a tray in his left, and using Said hand to jerk off your partner.
She was riding me half on then went into a side saddle then she pointed her finger gun me and holstered or fired it in my doo hole! Side saddle with shots fired.