What's on your mug?

means Hit Me Up. Usually used on snapchat stories/ replying to YOLO's that your friends put on their stories.

once you are done vibin' HMU.

By NOUCARD

Stands for "Hit me up." Simply means "call me," "text me," or some other form of "let's get in contact" with no other connotations. The exact meaning can usually be gotten from context.

HMU if you can help me out with this.

By halotroop2288

an abbreviation for hit me up

guy: hey shawty hw r u? girl: dont hmu BYEEEE guy: i-

By kriptonnnbitchh

lol

hmu, call me

By oreochilly

hmu means "hit me up" similar to "hml" its what someone says when they want you to text them

"hmu i'm bored"

By imacoolkid1