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1.
An intense experience after a similarly intense achievement of virility. Usually associated with men who are very comfortable with their own virility and have no doubt in themselves.
After James the paraplegic ran fifty yards down the field on shriveled legs and scored a touch-down he had a willgasm of immense proportions.
by willyumLOL January 20, 2010
 
2.
A truly orgasmic experience (somewhat akin to herbal essences, joygasm, eargasm, heartgasm etc etc) given by the mere sight, sound, smell or touch of Will Miller
Oh my god, Will just walked by me and I got a Willgasm!!!
by Dani April 24, 2005