This is slang from the UK although it is used in Australia as well and can be used in number ways:
1 To make a foolish statement;
2 To talk nonsense or rubbish;
3 To say something which is quite obviously false;
4 To exaggerate your abilities or knowledge of a subject;
5 To bluff or boast about something;
6 To be a self-aggrandising twat;
Husband: Did you…? Oh my gosh!
Wife: (embarrassed) Yeah, the beans are talkin’.
Husband: Well, you could have...
Wife: (indignant) I DID, but YOU just had to have curry. Actions have consequences.