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A kiss curl describes a lock of hair curling onto the face and usually plastered down. Although the curl could be flattened with saliva (hence its alternative name spit curl), soap or hair lotion was more typically used.
Video Kiss curl
Pre-20th century
In the late seventeenth century there was a fashion for fringes composed of curls described as fripons, guigne-galants, or 'kiss-curls', sometimes augmented with false hair.
Maps Kiss curl
20th century onwards
The kiss-curl was worn by both men and women.
It became a trademark of the singer Bill Haley, who wore a large spit curl over his right eye to divert attention from the other blind eye. Other people who became known for kiss/spit curls included Josephine Baker, Diana Ross, and Superman.
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References
Source of the article : Wikipedia