A fork of Rural Dictionary
DM stands for Designated Man. This is one of those bros who goes to the gym and tries to lift more weight than he can, attempts to pick-up and impress girls at all times, and do anything humanely possible to boost his self-ego. This type of guy is a huge tool yet because of the extreme "bro" antics, he can be quite funny.
Wow, Evan, did you just see that DM? He was just flexing his bicep to that girl he passed walking across Pearl St.