Also known as the "Slow Screw Against The Wall", this is a variant of the Slow Screw and Harvey wallbanger; the Galliano float from the latter gives this cocktail the "against the wall" part of the name.
Fill a tall glass with ice.
Pour the vodka and sloe gin over the ice.
Top off with orange juice until the glass is almost full.
Gently float the Galliano over the drink.
Garnish with the orange wheel and maraschino cherry.