DM means Direct Message.
What It Means: Twitter’s Direct Message feature lets you send private messages to your friends, or receive private messages from anyone. It’s especially useful for sharing information you don’t want to post in public, like your phone number or address. “DM” is slowly becoming the default way of telling someone to message you privately, much like “PM” in the past for personal message/private message. For example:
What It Means: Twitter’s Direct Message feature lets you send private messages to your friends, or receive private messages from anyone. It’s especially useful for sharing information you don’t want to post in public, like your phone number or address. “DM” is slowly becoming the default way of telling someone to message you privately, much like “PM” in the past for personal message/private message. For example:
by drpokewolf March 13, 2018
Get the DMmug. 
Gliding in the DM's-The complete overshoot of "sliding" In the DM's. For one to "glide" in the DM's you must enter his or her DM's so sly and smooth that it has a direct affect of positive result; to have an overbearing feeling of confidence that you will get a direct result from this action; only few posses the power to "glide" into the DM's.
by Apple jack January 6, 2015
Get the Glide in the DM'smug. by superalpa November 5, 2025
Get the DMSmug. 
by Xenko On Timing May 31, 2024
Get the mass dmmug.