As-you-do Definition
    phrase
  
 (informal, humorous) Used to indicate an unusual situation.
 I was memorising the dictionary, as you do, when I came across a strange word I had never seen before.
I was riding a yak up the Himalayas, as you do, when I noticed I wasn't wearing any underwear.
 Wiktionary 
Origin of As-you-do
-  
Probably a contraction of as one normally does, or something similar.
From Wiktionary
 
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