used to mention a friend or elderly mate.
Originated from England pre 1930s.
Tally Ho Old Chap!

Oh my Old Chap, it seems the elephant has destroyed our tea house! What a rotter!!
by EvilBoris October 28, 2005
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ones front-mounted, downstairs tummy banana.
"how's your old chap been since the cat got at it?"
by Dutts March 1, 2005
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A jolly old chap is a old english smart person who is quite definately a chav
by Penisejaculate October 15, 2013
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