back·slap·ping
 /ˈbækˌslæpıŋ/  noun   [  noncount  ]
  : enthusiastic praise or congratulations
   We had expected the candidates to criticize each other, but instead they engaged in mutual backslapping.
  back·slap·per /ˈbækˌslæpɚ/  noun  ,  pl   -pers [  count  ]
  backslapping  adj  , always used before a noun
   backslapping businessmen