I think it's pretty simple... He says he can't Christen it meaning he can't bless the relationship between some girl maybe he loves, or maybe who's just a friend, because he doesn't agree with it. That's why he's telling her not to mix with 'him'. And saying 'don't mix your drinks', maybe it's just when this girl get's drunk she goes with 'him'. 'Coming cap in hand' I think it means he's being sincere, cos it's polite to take a hat off when going into someones house (or used to be in days gone by).
I think it's pretty simple... He says he can't Christen it meaning he can't bless the relationship between some girl maybe he loves, or maybe who's just a friend, because he doesn't agree with it. That's why he's telling her not to mix with 'him'. And saying 'don't mix your drinks', maybe it's just when this girl get's drunk she goes with 'him'. 'Coming cap in hand' I think it means he's being sincere, cos it's polite to take a hat off when going into someones house (or used to be in days gone by).