During sex while doing it doggy style, as the male comes to reach his climax and ejaculates between the womans buttcheeks, and the male spanks the womans buttox from both sides making a thick, milky mess (better after the woman takes a long poop without wiping,{the rio vista CHOCOLATE milkshake ;).})

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life