It simply means u dont know, or don't want to take the time to explain something. Commonly used when being told something you don't understand.
Billy: "Hey, Jim you know the capital of Nebraska right?"
Jim: "I mean maybe"
Billy: "Well what is it then?"
Jim: "I mean maybe"
Jim: "I mean maybe"
Billy: "Well what is it then?"
Jim: "I mean maybe"
by Jtford May 29, 2016
by Jtford April 18, 2021