The name for a person that gets so drunk that they fall asleep on the floor and wake up to find they have vomittedand shit their pants.
"Omg! That girl was so drunk last night she deffinetly pulled a sleepies and poopies...and that guy guy still had sex with her..but not in the butt, obviously!"
It's when you have a late night conversation (usually while on the phone), while very sleepy. The next morning, you forget what you were talking about towards the end of the conversation.
Often a general lack of energy, even after an adequate night time sleep caused mainly by boring college classes or nothing to do. It is very common to young adults and teenagers.