A Scatological Anagram

Sir Thomas Browne, Works, ed. Geoffrey Keynes, vol. 3 (Chicago: University of Chicago Press, 1964), p. 274:

There were in my time two proctors of the same yeare in Oxford John Smith a man not well beloved and William Oldis a purblind dimme sighted, on whome these Anagrams were made:

William Oldis
silly dimme owl
John Smith
shyt on him