It stands for the Dalai
Lama, the spiritual head of Tibetian
Buddhism in Cantonese. The same word is also used to
represent a foul word in Cantonese meaning "I Fucked Your Mum".
Teacher: Swearing is not allowed in the classroom, students!
Student: Dllm 8745
Teacher: What did you say?
Nerd: Teacher, didn't you know that the Dalai
Lama is the spiritual head in the Tibet Autonomous Region?