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1.
An exceptionally warm vagina.
"Darling, I'm quite cold. May I please stick my frigid penis in your peter heater?"
af Christopher Blake Mitchell 30. januar 2007
 
2.
A term used by surfers to describe when they urinate in their wetsuits to relieve themselves and keep warm.
It was getting pretty cold out in the line-up, so i pulled a peter-heater and warmed right up.
af Michael Joshua 17. maj 2005
 
3.
A garment (often knitted) worn over male genitalia to keep it warm. Sometimes used in cold climates, but also sometimes used by male dancers as a costume piece. Also known as a "willy warmer".
Bart was getting a chilly wily, riding his bike in the winter, so he pulled on his peter heater and it was all good.
af Mr. Park-Ranger 1. januar 2007