A mountain slut is a nomadic creature who generally inhabits your local ski town. Technically "Mountainous Slutimus Maximus", mountain sluts roam the slopes searching for ski cock, snow board slong, and occasionally boarder bush (aka Lesbians). These surly slop tarts adapt well to high altitudes and cold climates, but sometimes are found in the valley. See "Valley Slut".
"Hey D-Rock, are mountain sluts posting up on the slopes or what son?"