KJ Apa Says He Once Ate Fast Food He’d Urinated On

KJ Apa says he once added his own secret sauce to some late-night McDonald’s … he urinated on his fast food order … and still ate it!!!

The “Riverdale” star was talking to Dylan Sprouse and Brendan Columbus on their “Wildmen” podcast about sobriety and addiction … revealing he will “abuse” anything that makes him feel good … from substances to food.

KJ launched into a story about a time when he was trying to be sober and simultaneously lose weight for work … which he says makes him do “crazy s***,” like order a mountain of Mickey D’s.

He explained he pounded half the order — 3 Big Macs, McNuggets, fries and a shake — and instantly regretted it.

KJ says he took the rest outside and peed on it so he wouldn’t eat any more … before purging the half he’d already eaten.

Problem is … KJ says he was so hungry after purging that even his own piss wasn’t enough to stop him from going back outside to polish off the urine-soaked leftovers.