doing a davies

Using only a day of annual leave to make a long weekend after an on-call 24hr shift.

Working a 24 hour shift on-call on a Wednesday (which results in having Thursday off as a rest day) and booking the Friday off as annual leave for a long weekend. If you were the person working the on-call shift, you would say that you are 'doing a davies' to imply that you are taking Friday off also.

doing a davis

Giving over-the-top and exagerrated commentary to real-life situations, in the same way a tv producer on a badly-rating morning show would do.

Man, that guy is doing a Davis...

Yea, - that guy is totally doing a Davis, big-time!