In the Harry Potter series there is a creature called a dementor that is used to guard the wizarding prison of Azkaban. Their special power is the ability to take the joy away from anyone they are near and their most lethal attack is the "dementor's kiss" where they can suck the soul out of a person.
This term can also refer to a case where a poor unsuspecting dude in a bar locks lips with the ugliest broad there. This can either be done by force or with the aid of beer goggles. The result is that he feels miserable and disgusted with himself. Quite like having one's soul sucked out.
"Dude! Dude! I saw that old hag give you the dementor's kiss. You ok?"
"duuuude I'm so ugh so *hiccup* wasted I couldn't even defwend meself."
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