They keep him BUSY
Breaking Bad Season 2, Episode 7
He's good. He's, uh, BUSY.
Breaking Bad Season 4, Episode 8
but I'm very BUSY at the moment.
The Big Bang Theory Season 12, Episode 10
If you're BUSY, I can come back.
The Big Bang Theory Season 6, Episode 4
If you weren't BUSY I'd ask you to join us.
The Big Bang Theory Season 6, Episode 1