Definition of chest bump in English:

chest bump

noun

informal
  • A gesture of greeting or celebration in which two people jump and push their chests together.

    ‘a celebratory chest bump from the team's coach’

verb

[WITH OBJECT]informal
  • Greet or celebrate with (someone) by jumping and pushing one's chest against theirs.

    ‘he went to chest-bump a teammate’
    no object ‘they chest-bumped and high-fived’