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
An inherited gift, passed down from generations. Most notable alumni: Dosh has employed this gift in his favourite sport Rugby. Although it may have sexual connotations, Doshes 'Guilly grip' is merely for improving his Rugby performances.
by JohnPorkOhio August 05, 2024