WAAS is not supported on the ASA. Technically, you can probably redirect to a device via WCCP, but you wont get what you are looking for. Check out the last bullet on theguidelines and limitations. Also, WCCP is only supported on INGRESS not EGRESS.
http://www.cisco.com/c/en/us/td/docs/security/asa/asa90/configuration/guide/asa_90_cli_config/access_wccp.html#wp1101443
Guidelines and Limitations
The following WCCPv2 features are supported for the ASA:
•Redirection of multiple TCP and UDP port-destined traffic.
•Authentication for cache engines in a service group.
•Multiple cache engines in a service group.
•GRE encapsulation.
The following WCCPv2 features are not supported for the ASA:
•Multiple routers in a service group.
•Multicast WCCP.
•The Layer 2 redirect method.
•WCCP source address spoofing.
•WAAS devices.