This is the 13025th most frequent German word.
abgefahren
"Abgefahren" means "awesome" or "crazy" (slang), or "departed" in a literal sense.
Here, 'abgefahren' is used as the past participle of the verb 'abfahren', meaning 'to depart'.
Der Zug ist pünktlich um 9 Uhr abgefahren.
The train departed on time at 9 o'clock.
Here, 'abgefahren' is used as a colloquial adjective meaning 'cool' or 'amazing'.
Das Konzert gestern war echt abgefahren!
The concert yesterday was really amazing!
In this context, 'abgefahren' is used as an adjective to describe something unconventional or strange.