subs. (Cambridge).—A W.C.: hence the old undergrad wheeze:—

        When is pote put for pros?
When the nights are dark and dreary,
When our legs are weak and weary,
When the quad we have to cross,
Then is pote put for pros.

1

  Adv. (streets’).—See quot.

2

  1887.  Walford’s Antiquarian, 253. PROS means proper. Nothing but the word prosperous offers in explanation.

3