this is when you are making out with your significant other and you casually put your hands on their cheeks, but then quickly plug their nose and try to suck the air out of their lungs.
Dwight: Prison Mike, what's the very very worst thing about prison?
Angela: (under her breath) Don't encourage him, don't...
Michael: The worst thing about prison was the... was the dementors! They were flying all over the place and they were scary and then they'd come down and they suck the soul out of your body! And it hurt!
Karen: Dementors... like in Harry Potter?
Michael: No... Not Harry Potter.
They guard the prison of Azkaban. They suck all the happiness out of people and you'll feel like you'd never be happy again when a dementor comes near you.
"Dementors are among the foulest creatures that walk this earth. They infest the darkest, filthiest places, they glory in decay and despair, they drain peace, hope, and happiness out of the air around them. Even Muggles feel their presence, though they can't see them. Get too near a dementor and every good feeling, every happy memory will be sucked out of you. If it can, the dementor will feed on you long enough to reduce you to something like itself...soul-less and evil. You will be left with nothing but the worst experiences of your life."