A slag bean is someone who sleeps around and you can open their legs like a tin of beans
you hear about that girl over there? she is a slag bean
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when someone has sexual relations with three generations of one family.
person 1 -did you head about that lad, he done 3g with that girl?
person 2 -wait what is 3g?
person 1- 3g is where you have sex with the daughter, mum and nan its three generations!!!
person 2 - what a hero!!!
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