When a guy calls you "ma," it is likely a casual and affectionate way of addressing you. The term "ma" is short for "mama" and is a term of endearment that some people use to show familiarity, fondness, or friendliness towards another person. It can be seen as an informal way of saying "mom" or "mother," but it's not meant to be taken literally in this context.
In some cultures or regions, people use "ma" or similar terms as a friendly way to address someone, regardless of their age or gender. It can be used among friends, acquaintances, or even strangers in certain situations.
It's important to consider the context and the individual's tone when interpreting the meaning behind this term. In most cases, it's harmless and simply a friendly gesture. However, if it makes you uncomfortable or you feel that the person is being disrespectful, you should communicate your feelings to them so they understand your perspective.