1.When a male is so arroused by his soon to be sexual partner that his cock will remain erect for countless days on end.
2.The pussy is so good that you feel as if your dick will remain erect for a long time. As if you were on Viagra.
Phil: hey joe this bitch was so fly my cock stayed hard for 3 day fuck fest.
Bill: Yea I caught this one shorty gave me dick for days!