Acronym for the phrase, "Love U Man".
Often used in Instant Messaging, emails, in casual conversation, LUM has been adopted by many as a more comfortable way of closing a conversation.
Lum is Botswana slang for relaxing/ chilling when you are wasted baked. It defines the sleepy, drowzy feeling you get at the end of a large smoke up with your mates. Incorporated into such expressions as: