on_the_go
1. [ adjective ] (of a person) very busy and active
Examples:

"is always on the go"

Related terms: active
Similar spelling:   on_the_job
  on_the_spot
  on_the_hook
  on_the_QT
  on_the_sly
  on_the_side
  on_the_Q.T.
  on_the_quiet
  on-the-job