Definition of backslap in English:

backslap

verb & noun

See backslapping

‘It's too late to expect this election year to end with handshakes and backslaps.’
  • ‘They film him conducting ‘interviews’ with players in which the ‘questions’ seem composed entirely of hearty guffaws and backslaps.’
  • ‘He swaggered to his feet, and went through the male welcoming rituals of handshakes, backslaps and a slap on the butt.’
  • ‘Well the old left, of the Ivy grads who backslapped each other, is dead.’
  • ‘Instead, families continue to backslap and high-five across the table.’