1. euthanasia: the act of killing someone painlessly (especially someone suffering from an incurable illness)

2. Killing by one person of another who has an incurable illness or injury in its most painful stages.
My mom gave my grandpa a whole lot of pills and said it was ok because god doesn't punish mercy killing.
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Mercy sex is sex, coital or oral, given a guy for comfort reasons rather than because of desire or love.
After Seamus had taken her to dinner Molly felt that she needed to give him some mercy sex.
by Heather Yamamoto January 29, 2006
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Going on a date with somebody because you feel sorry for them. Often a male on the rebound or a female one considered 'ugly'.

See also mercy sex, mercy jump, mercy fuck, pity sex
Donna saw how upset James was after Rachel dumped him, they ended up dating for a short while.

"Yeah. I felt sorry for her, and I didn't want to upset her. So I took her on a mercy date."
by Abitha-Evie July 5, 2006
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"thanks a lot" in french
merci: thank you
Beacoup: plenty, lots of, much
by ~chacha~ June 21, 2006
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Best band ever, and just because they helped define a genre, doesn't mean that listening to them makes you a poseur.
As in: The Sisters of Mercy are THE BEST BAND EVER, and I listen because they're GOOD, not because I want people to think I'm tragically goth.
by somgoth June 24, 2008
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Merion Mercy Academy is located in Merion Station, PA, and is by far the actual best all-girls school in Philly, yet is half the price of all the other snobby WASP Inter-Ac schools like EA, Agnes Irwin, Baldwin and is way more diverse than other Main Line girls schools the Academy of Notre Dame or Villa Maria. And, you actually have to be smart to get in. We're also just much better than the Mount. Period. Riley the dog is our one and only love, the messy bun is part of the uniform, and STP rules the school. We root for the Golden Bears, and Catherine McAuley's teachings play a central role in our educational philosophy. Our year is filled with fun stuff like Weenie Roast, Red Green Jingle day, Harvest Moon, etc... We have the best cafeteria (Dining Commons) in the Delaware Valley and the fries are divine. St. Joe's Prep guys are literally falling over themselves to date MMA girls. You'll meet girls from Delco, Montco, Philly and even South Jersey. Simply put Merion girls dominate in all they do!!! Three cheers for the blue and the gold!
Girls will be girls, but Merion girls will be ladies!

WE ARE?
Merion Mercy!
WHAT DO WE DO?
Live Mercy Seek Justice!
by southphillyclout January 16, 2018
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fucking someone you really don't want to but you do it anyhow because you don't want to hurt their feelings.
even though I didn't like her I mercy fucked her so she wouldn't feel bad
by handle August 15, 2003
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