Daaaaaaaaaaaaamn (13 A's) is an online phrase posted whenever somene uses modern lingo or shortening of words instead of proper words for quick internet speak. The person who is receiving or views the posting of the shortened word will post Daaaaaaaaaaaaamn.
Person A- "See you later, brb"
Person B- Brb Daaaaaaaaaaaaamn
Person A - "So funny ROFL!"
Person B- ROFL Daaaaaaaaaaaaamn