Definitions by Dr. C.C.

Pillow Mouth 

a term to describe an anatomic quality of a woman in which during the act of fellatio, there is disambiguation of where the tip of the penis ends and where her mouth begins, likened unto putting your cock into an incredibly soft pillow.

Dude, she's got a pillow mouth; I had to marry her.

Pillow Mouth by Dr. C.C. April 9, 2012