Expression of extreme anger or disappointment but expressed in a humorous way to release your negative emotions.

Origin:
There is a painting ''Femme a la robe orange'' depicting a lady wearing ''Ao dai'' with a contemplating expression by artist Mai Trung Thu. When the color of this ''Ao dai'' was changed to purple and the phrase ''Giận tím người'' was added to make it interesting.
Example:

No sooner had I washed my motorbike than it rained cats and dogs, giận tím (cả) người!!