1 definition by Bart Hodolmyer
A person says "main man," especially so others may hear, to insinuate that they have a number of friends; the target of "main man" is just one of many friends that this person has. When a person resorts to saying "main man" outloud, he or she wants the world to know that he/she has many friends other than the target of "main man," so often the person who says "main man" may have insecurities or personality traits that result in him/her not having many friends.
The homeless person, who does not have many friends, said "main man" to me to suggest that I was just one of his many friends.
by Bart Hodolmyer June 30, 2015