A sex act where the male takes a dump on a girl's boobs and then proceeds to fuck her tits, using said faecal matter as lubricant.
Why did he dump me? Icedocking, wolfbagging, even shitty titty bang bang, I do everything!
My friend's favourite porn. It involves a chest, male or female, and a whole lot of shitting on said chest.
Seb: "Aww man, I came so hard last night!"
Joe: "What were you jacking it to?"
Seb: "Oh you know, Some Titty Shitty Bang Bang!"