A dirty (used) diaper which has been carefully rolled up to contain excrement, but was still thoughtlessly discarded in a parking lot.
"Hey look, that lady just left behind a parking lot burrito. I wish she'd clean up after her kid properly."
Frequently used when two employees meet in the company parking lot to settle their grievances with fisticuffs. The victor can claim he gave the loser some "Parking lot Therapy."
Stan kept bullying Bob. On day, after work, Bob gave Stan some "Parking Lot Therapy" or PLT by massaging Stan's face with A BLURR Bob's fists. Now, Stan doesn't bully anyone. PARTICULARLY Bob.