A Beri Eri is a girl that has a penis longer than the average. A Beri Eri gets sexually aroused by performing intimate activities with bird-like creatures, an example of a bird-like creature could be a duck.
person 1: you are into some weird shit, mate.
Person 2: no I am not
Person 1: you are a Beri Eri.
Son: mother I like girls, but only a Beri Eri.
mother: that is fine I support you