When you have sex with a girl on her period in a shower. Each thrust produces blood that trickles down your leg and swirls into the drain recreating that famois scene from the movie Psycho.
"I had sex with my girlfriend in the shower. I realized she was on her period when i looked down and saw blood spinning down the drain."

"Dude, you just earned your Psycho wings!"
by CycleBreak January 1, 2022
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