It's a compliment.
If you sees a hot guy (because it's used by girls mostly) and that's makes you having some sexually thought which is not appropriate but you feel it right. Then you can use sweet mercy.
by Kate Darcy November 25, 2018
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sweet mercy : a very desirable state of forgiveness

most commonly used in a positive way: if someone's attractive , turns you on, you just can't believe someone as hot as that exists... or

in negative connotation: OH MY GOD! how could they do something like that ...
oh sweet mercy! Look at him/her! ( in this context meaning: Oh My God, like when someone sees someone attractive or their crush, however can also have a negative connotation behind the phrase such as : Oh my god , I can't believe they'd do that !)
by Ro9201 July 3, 2018
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When an older age man/men are/at a bar with young women and give off a very distinguished rapey vibe
Josh went to a bar and sweet lawd have mercy they were ripe
by Nipple Knockers March 25, 2021
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