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.
Dame: mmm baby I do love makin out with you

Fella: your lips are so soft, I could do this all night

Dame: c'mere closer

Fella: what you got in mind for me

Dame: (sucking in) Haaaaaarrrryyyy Pottterrrrr

Fella: GASP GASP I do hate the Dementor's Kiss
by RJ_MacReady January 20, 2012
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While kissing french or otherwise, one partner will suck the air (soul) out of the other partners mouth and lungs. Also effective in sucking the happiness out of the room.
Steve: If I know I'm not getting any with a girl, I'll give her a Dementor's Kiss.

Dave: What?

Steve: I'll kiss her so I can suck all the air out of her and kill the mood even more.

Dave: What does that do?

Steve: don't know if I'm not getting laid it's just fun.
by Duck duck goose you jerk January 15, 2012
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When smoking, inhaling the smoke someone else is exhaling while kissing.
Jaime: Yeah Ben and I were smoking and we did some Dementor's Kisses.

Laura: Wow you must have been baked!
by spookymulder July 28, 2013
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The act of sucking the air out of your partner's lungs during a make-out session.
During a make-out session with my boyfriend, I (quite sweetly) uttered the line “you take my breath away”. He leaned in to kiss me again, and as we were doing so he literally sucked the air out of my lungs before exclaiming “That’s what it feels like to be a Dementor!”
The worst thing…his geekiness actually turned me on a bit.
~ A Prisoner of Azkaban, College Humor, after experiencing a Dementor's Kiss
by Nosperato January 12, 2012
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the act of drinking water after chewing mint gum
The Dementor's Kiss temporarily caused Susan to have an existential crisis.
by peachcrusts November 12, 2017
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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."
by lick_mah_clit March 24, 2012
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An extreme case of Social Dementorism in which the loser sucks up another person's entire lifestyle, from wardrobe to basic personality traits
Greg: "Whoa, that kid completely stole every aspect of your being!"
Mike: "I know! He performed the dreaded Social Dementor's Kiss."
Greg: "Yeah either that, or he wants to fuck you real bad."
Mike: "True... True."
by the G-Bear February 24, 2014
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