A couple who sustained a relationship throughout and after high school and later on to marriage. These couples tend to be the strongest and happiest couples.
Brett: Wow Dylan and Tori have beentogether forever Bretts Cat: Yeah that's because they are high school sweethearts!
Brett: Wow they look so happy.
A phrase that contains many types of scenarios. The person may use it to compliment you or as an insult. The person may use the word “Sweetheart” to not call you another name like the word “Bitch”