What IS a cork?

So my friend and I were arguing what a true cork is, and he is seriously convinced you have to flip when doing a cork; I thought it was something that was more of a tilt. Anyone care to clarify, because clearly one of us is wrong :(
 
it's an off axis spin in which your head doesnt technically go below your waist. seriously though, searchbar, google, wikipedia that shit, do something else other than make this thread.
 
something you plug your wine bottle with haha.

but seriously man, just search up top for this kinda stuff... you'll find more answers than you could ask for.
 
A few years ago a cork spin was considered off axis but not inverted, but it seems that more and more people today consider a cork to be any sort of backwards flipping spin.
 
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