Green’s Dictionary of Slang

1. a prostitute.

1935		in Amer. Mercury June 230: Kelsy: a broad on a cash basis.
1964		B. Jackson Get Your Ass in the Water (1974) 106: She was three-quarter Kelsey with mossy glossy hair, / she was a stompdown mudkicker and her mug was fair.
1966		Trimble 5000 Adult Sex Words and Phrases.

2. straight hair: a popular hairstyle, favoured by many prostitutes [orig. carnival use].

a.1955

‘Pimping Sam’ in D. Wepman et al. Life (1976) 147: She was a stomp-down mud-kicker with kelsey hair.