(slang) The penis and testicles.
But, sure enough, there in front of you, he was gyrating in his jumpsuit and jiggling Big Jim and The Twins around for the entire world to see.
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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.