Green’s Dictionary of Slang

(US) excellent, wonderful, first-rate; usu. in comb. as balling chick, an attractive girl or woman.

1952		(con. 1948) G. Mandel Flee the Angry Strangers 230: Along come three Vipers and some balling chick with them.
1958		E. Gilbert Vice Trap 11: You can’t figure a balling chick.
1961		H. Ellison ‘High Dice’ in Gentleman Junkie 90: Balling chicks with nice smooth shins above their bobby socks.
1967		L. Bruce in Cohen Essential Lenny Bruce 143: What’s behind Welk? A woman—firm, with fantastic measurements: 96, 4, 53; 112 pounds; two feet tall. Grotesque? But a balling chick.
2012		C. Eble (ed.) UNC-CH Campus Sl. 2011 2: BALLING — fantastic: ‘The professor’s decision to postpone the test another week is balling’.