Penis Tranquilizer
A person who is so ugly, that when A man with an erect penis sees the person, their penis immediately shrinks as if they jumped from a hot tub into a cold pool.
I was at the beach when I saw this girl who had some nice tits. I saw the tits and got a huge erection, but I lost my erection when I saw that bitches face. She was a penis tranquilizer for sure.