n. An extra large hard-on achieved when particularly aroused, although still probably smaller then 3 feet.
His dick was so big, He had a yard-on
de yo'neill 26 février 2008
3 foot hard on, could be used as a cruel term for someone who is morally "the biggest dick".
John is the biggest "Yard On" in the world, he tells me were going to go to the movies than takes another chick out to dinner!
de Streetpolitician 24 mars 2011