1) The space between the breasts of a woman. Can be formed naturally but normally appears on women that have poorly implanted fun bags.
2) The space between the breasts of a fat girl. The space is normally used to stimulate the cock of a man that likes to tittie-fuck nasty ho's.
a.k.a cock canal
Dude, did you see Tara Reid's nip slip?
Yeah bro, her nipples are fucked but I would love to slide 'shorty' in her cock channel.