Top Definition
Older men who chase after younger women.

Grandpa Roosters are usually found hanging out in modern establishments while checking out the young hot chicks. They try to avoid being seen with the Old Hens (the women in their own age group).
Hey check out creepy Grandpa Rooster over there, he's been pecking around the younger chicks all night! How embarrassing!
by Blue Topaz February 10, 2011

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