Andy Dalton: I LOST MY LUGGAGE AGAIN!!!

Dude. Seriously?!?!

The search is back on for Andy Dalton's suitcases ... 'cause just 5 days after they fell out of the bed of his truck, they've gone missing ... AGAIN!!!

This time, it appears to be the airline's fault -- with the Bengals QB tweeting, "I can't make this up... #bagsearch2016 is back on. @AmericanAir it's your turn to find the luggage now #unbelievable."