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Variously spelled as Wullie, Wully, Willie, Willy
  1. Scottish hypocorism for the name William
  2. Scottish term for penis
  3. Sometimes used as a Scottish insult

Haw Wullie, shows yer wullie
I am not asking William to show me that he actually is William here (as might be thought at first reading of the phrase), I am asking William to show me his penis
Shut it ya Wullie
Be quiet you stupid person
See also Boaby, Dick, Walloper, Tadger