What does it mean when a man says he doesn’t put a gram in his mouth about her?

When a man says he doesn’t put a gram in his mouth about her, it means that he doesn’t believe what she says and he doesn’t trust her. This phrase is a metaphor that implies that the man is not taking anything that the woman is saying seriously, and he is not putting any effort into considering her words or her opinions. This phrase is often used to express disbelief or to indicate that the man has no interest in what the woman has to say. It can also be used to express frustration or annoyance with the woman’s words. In any case, this phrase is not a positive one and implies that the man does not trust the woman or take her words seriously.