So named for its similarity to Adolf Hitler's moustache, which was threefold:
a) It was also narrow and dark.
b) It also "lay above the lips".
c) It can move hypnotically, with a strange effect on the weak-minded.
Then I asked my second girlfriend if she would shave her Map of Tasmania, and it turns out she was an Australian Aborigine so she cut me with a flint-knapped knife.
Last night I asked my third girlfriend to shave her Hitler tash, and she looked at me and said "I'm Jewish".
If the Mossad come looking for me, I'm not at home, okay?