67 is a word and it's
pronounced Six-Seven not Sixty-Seven. It's a verb where you move your hands in an up-down alternating gesture. You can write Six-Seven instead of 67 if you want.
Base Form: to 67.
Simple Present: I 67, She 67, They 67
Simple Past: I 67ed, (Six-Sevened)
Present
Participle: I'm 67ing (Six-Sevening)
Past
Participle: 6seved (Six-Seved)
Present Third Person: Doing 67s, It 67s, She 67s, He 67s.
Imperative: 67!
Gerund: "Six-Sevening is fun."