In British slang it means someone that has a low sperm count. Jaffa is an orange that is seedless (hence the name)
Also in Britain Jaffa Cakes are a type of biscuit/cake that are chocolate covered with a fruit inside
In British slang it can also mean someone with red hair
Bill: Can you have kids?
Terry: Nah, I'm a Jaffa
Bill: What do you mean?
Terry: I'm seedless
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Bill: I'm hungry
Terry: Want some Jaffa cakes?
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Bill: You are a prat
Terry: Well you're a jaffa head
Bill: Don't make fun of gingers!
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