When you're too retarded and/or lazy to try to fish someone's name from the depths of your endlessly blank mind to address them properly.
"Get out of my seat, my dude"
Eugene: "Eugene hails to NO ONE! ALLAH ACKBAAAAR"
By Melania
My Dude
Informal
The white boy equivalent of "My nigga!"
Usually used in place of a name or title.
Infrequently used to represent a boyfriend or male companion, otherwise referred to as my mans.
Can also be used as a greeting or salutation.