Shit hit the drain

Malaphor of the idioms "Shit hit the fan" and "Down the drain"

When something so nasty works out so right it is as if you took a shit and it went straight down the drain as it fell.

"Bro I told Brittany I wanted to tie her legs to the ceiling, strip her down, and coat her in cream cheese and the broad says she wants to see me Friday night! The shit hit the drain for real this time man."