Despite being level at half-time in Wednesday's Champions League last 16 first leg tie, the Gunners capitulated in the second half to leave on the brink of elimination.
Alexis Sanchez had given the visitors hope as he cancelled out Arjen Robben's impressive opener but the tie completely swung in Bayern's favour in the second period.
Four goals without reply, from Robert Lewandowski, Thomas Muller and two from Thiago Alcantara, means Arsene Wenger's side are facing a monumental uphill struggle to stay in the competition.
And Bayern were quick to rub it in on social media, tweeting "same again next year?", referencing the fact that the Gunners had been beaten 5-1 by their German counterparts back in 2015 as well.
Goals from Lewandowski, Muller, Robben and David Alaba did the damage that night, with Wenger's side suffering what was then a record-equalling European defeat at the Allianz Arena.