Dementor

Creature who feeds on the happy emotions of humans, leaving one cold and sad. The kiss of the dementor is when the dementor sucks the very soul out of a human, leaving you emotionless.
Origin:
Dementor - a play on the word "demented", or crazy. Thus a Dementor is one who makes you demented.

When the Dementors kiss you on the lips and suck out your soul.