WAP games are a type of mobile phone based game that use the WAP (Wireless Application Protocol) to communicate with central game servers and other players. They are generally interactive and multi player. Strictly speaking, a WAP game would use the WAP protocole, but the therm has now broadened a bit to include many different games on mobile phones, whether they are using WAP, GPRS, UMTS, HSDPA etc. They are particularly popular in regions with poor signal streanght / accessibility.
You can get some WAP games at these sites: