Top Definition
The effects on your dick from over indulging in extacy; Similar to swimming in Guillamene Cove, Tramore where the water is so cold your willy shrivels within itself.
Jesus Boy! I had some bad case of Guilly Willy last night, I could only use my finger and thumb and some seriously disturbing porn to wack one off.
by Plastician March 18, 2010

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