Sexual intercourse that takes place up against a wall, usually furtive. Most often takes place due to not being able to share a bedroom with
one's
love when visiting family for the holidays, because of strict parental guidelines, regardless of
one's age.
While everyone was in the dining room feasting on the Christmas goose, Mark and Christine
snuck around the
corner by the den for a wallbanger before dessert arrived on the
table.