มั้ง

most likely, like as not, perhaps. Often best rendered in English as, "I suppose that...;

could it be that?" (short for กระมั๊ง).

บางทีคุณคงไม่อยากมากับผมกระมัง Maybe you don't like to come with me.

เขาคงไม่อยากไปมั้ง - Maybe he doesn't want to go.