Green’s Dictionary of Slang

(US) absolute comittment, gut-level desire.

1972		D. Jenkins Semi-Tough 51: ‘[T]hat dog-ass Buford on the other side don’t show me a lot of want to’ .
1973		in Sports Illus. 3 Dec. in Davis (ed) Land of the Permanent Wave 215: ‘When I can’t reach down and pull up a bunch of want-to out of myself, I’ll know it’s time to quit’.