A person that is sexually attracted to a person that is much older than them.
Typically, this term refers to a minor that prefers an older person (also known as reverse pedophilia).
More typically, this term refers to a homosexual person.
"OH MY SACRILEGE! That guy is so hot! I'd give 'im one."
"Dude, he's like 80 - you are SUCH a buzzard hawk!"