A kit used to attain straightness of hair. Used to get rid of what we black folks call "naps". It presents a false sense of neatness because if you don't keep using it, the waves dissappear. Not to be confused with the waves that are acheived when using a brush, grease, and a durag. S-Curl waves are pretty but fake.
Nigga #1:Did you see Ray Ray's hair?
Nigga #2:Yeah it was wavy!
Nigga #1: That shit ain't real, that nigga got an S-Curl yesterday.
Nigga #2:What's an S-Curl?
Nigga #1:Go look at my definition on urbandictionary.com, bitch..