Can either mean two things: McDonald’s messed up your chicken nuggets or you were darkened/burned by the sun.

A girl called Amber Wilmott in radcliffe school

Your mom's world-famous Chicken Nugget Casserole (Has green beans, burnt chicken nuggets, and cheddar. Ohhhh)

A burnt chicken nugget is what you call your friends when they are being dumb and/or stupid.
You may also say this for when you have a burnt chicken nugget at McDonalds or when you have burnt food.

A chicken nugget that has been in the stove for too long and now is black (burnt).

refers to one who looks, feels, or tastes like a burnt chicken nugget.

It equals a crispy chicken nugget