mish-SAG means: Noun. “Missionary slide-and-glide”. “Missionary slide-and-glide” A sexual position where a man, in order to have intercourse while in the missionary role, leans forward and pushes his knees towards the woman’s head. Before you attempt this fluid maneuver, make sure that the northern pass has received maximum lubrication. (in Community Dictionary, added by Jaron Pineda)