Sweet Mercy 

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.

Sweet Mercy by Kate Darcy November 25, 2018

Oh Sweet Mercy 

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 !)

Oh Sweet Mercy by Ro9201 July 2, 2018

Sweet lawd have mercy 

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

Sweet lawd have mercy by Nipple Knockers March 24, 2021

Well, sweet mother Theresa on the hood of a Mercedes Benz, you sound like a majestic f*cking eagle 

When you hear Armin Arlert's voice for the first time.

Keith Shadis-- Well, sweet mother Theresa on the hood of a Mercedes Benz, you sound like a majestic f*cking eagle.

Well, sweet mother Theresa on the hood of a Mercedes Benz, you sound like a majestic f*cking eagle by fifalinathesoccerball December 25, 2014