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 !)
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