Is this grammatically correct? My man joined me in this. Or my man joined me on this. What does it mean?

Both phrases can be grammatically correct, but they have slightly different meanings based on the preposition used. 1. **"My man joined me in this."** - This suggests that your man is participating alongside you in something, such as an activity, project, or cause. The use of "in" implies collaboration or shared involvement. 2. **"My man joined me on this."** - This typically indicates that he is accompanying you on a specific matter or topic. It might imply a sense of support or agreement in a particular situation, although it's less commonly used in this context than "in." In summary, "in" emphasizes partnership in an activity, while "on" may suggest support or participation regarding a specific issue or topic. Choose the one that best fits your intended meaning.