A pillow biter is an individual who is in the act of being brutally pounded in the ass. Thump thump thump clap clap clap go the ass cheeks as this person bites down on a pillow to keep from screaming as his or her asshole is being torn open over and over and over. There are a lot of them in prisons.
A passive gay male. The term originatied in an infamous court case involving a Political Party leader accused of conspiracy to murder his alleged male lover. When cross examined the lover went into great detail as to how the accused seduced him to the point of his arse being penetrated and stated he "bit the pillow" whilst he endured it.