1. Meaning: When you join the fandom without even noticing
  2. Example:
  3. A: OMG! I think I just got Deogtongsago by BTS
  4. B: HAHAHAHA welcome to the ARMY World!
  5. Etymology: Deog (덕) here stands for Deogjil (덕질) which means Fangirling + tongsago stands for Gyotongsago (교통사고) which means car crash.