What is Midnight Snack?
1.
When a person decides to eat way too much food at an unsightly hour of the night.
George: *goes into the kitchen and sees Dan* Why the hell are you eating a salad, a steak, and ice cream at three in the morning?
Dan: It's just a midnight snack...
George: Whatever you say, fat ass.
See
2.
When you put your dick in a girl's mouth right after you did her anal and theres a little remnant of what she ate that day on the end of your dick.
I think she ate corn tonight cause i just gave her a midnight snack.
See
3.
when a person passes out, shits themselves, rolls around in it and eats it while sleeping
Billy had a midnight snack after getting drunk last night.