i mean, it really depends on the situation, but they're sick as fuck in like, BC step ups and off of cliffs into powder, but they're not always that sick in the park.... my 2 cents
Technically that is not a requirement for it to be cork. But in reality this happens on anything over a cork 5 most of the time, but a cork is just off axis. Once your feet go above your head by a decent amount we get into the whole "Is this a d-spin?!?!?" discussion. So don't have to go inverted and cork 1's are possible.
definitely did a cork 180 today. I shit not. I was trying a few hand drag 180's on a step up and one of them I came off pretty much completely corked. It was a terrible landing and touched my side down but still managed to ride away.
I think that a cork is a spin between a normal spin and a sideflip. I mean if you do a sideflip the axis is longitudinal, and if you do a normal spin the axis is vertical. In a cork the axis should be between these and if you spinned around that axis, it would be a cork 3! So if you want to do a cork 5 you want to add 180 to it and if you wanted to do a cork 180 you should take a 180 of it. in that case you spinned 360 and then 180 in the other direction... I think cork 180's aren't possible.
Sorry if you didn't understand, my English isn't the best and I was trying to explain a complicated thing. So don't get mad!!