fist-bump
verb /ˈfɪst bʌmp/
  /ˈfɪst bʌmp/
 [transitive, intransitive] (informal)Verb Forms
| present simple I / you / we / they fist-bump |  /ˈfɪst bʌmp/  /ˈfɪst bʌmp/ | 
| he / she / it fist-bumps |  /ˈfɪst bʌmps/  /ˈfɪst bʌmps/ | 
| past simple fist-bumped |  /ˈfɪst bʌmpt/  /ˈfɪst bʌmpt/ | 
| past participle fist-bumped |  /ˈfɪst bʌmpt/  /ˈfɪst bʌmpt/ | 
| -ing form fist-bumping |  /ˈfɪst bʌmpɪŋ/  /ˈfɪst bʌmpɪŋ/ | 
- fist-bump (somebody) to do a fist bump with somebody as a way of saying ‘hello’ or of showing support or agreement- Several of the politician’s supporters fist-bumped him as he left the stage.