An exceptionally vigorous butt-pounding between men in the dorsal-ventral position, generally noteworthy for its combination of depth, force and velocity, such that the poundee is transported to an otherworldly, orally-fixated state of extreme "hurt-so-good" pleasure as to unconsciously bite down on a pillow, duvet, forearm, Jack Russel terrier, or anything else that happens to come with close proximity of his mouth.
Josie: Did you see Tom last night?
Johnny: Until the lights went out, then I saw stars.
Josie: Total pillow-biter, huh?
Johnny: Been spitting out feathers all day.
Josie: The Tomster sure likes to pound ass.
Johnny: One of his many charms.
Johnny: Hey now...
A gay man, generally who prefers the "recieving" end in anal sex. A "bottom."
I hear that Phillip is a pillow-biter
Someone who enjoys doggy-style being so hard they have to bite the pillow to muffle their screams/moans.
Joe: So, what was she like last night?
Bob: She's a total pillow-biter, dude!
Example 2 (insult)
Used in conjunction with calling someone a father-fucking queer, usually non-consensually. Used in reference to the fact that the boy bites his pillow whenever he hears his father open the door.
Did you see the newspaper? Philip over there is actually a pillow-biter, his mom caught his dad pounding him doggie last night.