(slang, British, NZ, AU) A secondary lover, a mistress.
I'm married to Paula, but Jackie, my bit on the side, is far more fun.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.