A symptom of too much fucking. Mostly in the doggy-style position where the guy pushes the girls face into a pillow and proceeds to plow away, either anally or vaginally. The girl, loving every minute simply cannot move her head from the pillow creating creases in her face. Thus, a pillowface.
a sexual position involving two men and one woman. The men, standing up, position themselves at opposite ends of the woman. The woman lays either on her back or stomach meanwhile the men shove their erect penises, one in the mouth one in the anus or vagina. The men's erections prop the woman in mid-air. Thus making, a banana hammock.
Other versions can involve three women and two strap-ons or three men or three she-males.
Tool A: Bro, wanna run a train on your mom tonight?
Tool B: Nah dude, let's just put her in a banana hammock, she looks rather tired.