As well as a full grown male kangaroo it can be anyone of us born in the 1950's, as it is the informal term for a Baby Boomer
Apr 23 2003, 2:15 PM
cartwheel45
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cartwheel45 16 year member
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Male kangaroos are called bucks, boomers, jacks, or old men; females are does, flyers, or jills, and the young ones are joeys. The collective noun for kangaroos is a mob, troop, or court. Kangaroos are sometimes colloquially referred to as roos.
https://en.wikipedia.org/wiki/Kangaroo