NFL star Joey Bosa is a quarterback's nightmare on the football field, but he admits he's no match for Joey Chestnut ... telling TMZ Sports he's predicting to take an L from the professional eater in Monday's pistachio contest.
The Los Angeles Chargers defensive weapon will be participating in the second annual Wonderful Pistachios Get Crackin' Eating Championship on the Santa Monica Pier ... where he will have eight minutes to out-eat opponents for the title and a $10k prize.
Bosa -- who recorded 6.