1)a complicated sexual act which involves one man and two women in which the man attaches a strap-on and faces it backwards, positioning one woman in the front and one in the back, rocking to and fro thus enabling the pleasuring of two women at once
2)the name is derived from the plight of modern society, or male-pattern baldness, in which a man suffers from the lack of hair in the front and on top; thus, creating a horse shoe shape of hair on the head (e.g., my father Reggie).
3) If lacking a strap on, a frozen banana clinched between the buttocks will suffice.
Those two dirty sluts let me put them in the horse shoe! Holla!