A Sunday sweetheart is a little girl or boy who is a suck up to the parents and use tears to get certain things.
Person- Bro my sister is such a Sunday sweetheart!
Friend- Oh she must be a Sunday sweetheart!
Person- Yes! So annoying!
Friend- Oh she must be a Sunday sweetheart!
Person- Yes! So annoying!
by Koolkatbro193847292 July 2, 2018
Get the sunday sweetheartmug.