When a girl/boy is in a relationship with a man/woman whom is atleast 15 years older than they are.
Delores and Humbert where in a May/December relationship; she was 18, he was 45.
by ManaEGL August 01, 2005
1 more definition
a relationship between people, with a large age gap.
Dude James' girlfriend is 1 year younger than his mom, talk about a may-december relationship.
by anon April 12, 2005