out over one’s skis
other—Gloss: being ahead of oneself or behaving rashly. «Some advertisers like Coca-Cola have expressed surprise that Beacon then required users to take action if they did not want the messages sent out. “This is a bit of an example of Facebook being, as we refer to it, ‘out over your skis.’ They got a little bit ahead of themselves.”» —“Apologetic, Facebook Changes Ad Program” by Louise Story New York Times Dec. 6, 2007. (source: Double-Tongued Dictionary)
Further reading
Why do people say They don’t geehaw to mean “They don’t get along”? Geehaw, occasionally spelled jeehaw, comes from the calls people use to drive a team of animals, such as oxen, mules, horses, or sled dogs, gee being an...
There’s no evidence that anyone named Sam Hill inspired the phrase What in the Sam Hill? It’s almost certainly just a euphemism for What in the hell? This is part of a complete episode.
Related
This is sort of interesting. You would think that something like this would have originated in the skiing world, and yet in 21 years as a skier (and 8 on the US Ski Team) I’ve never heard it.
Maybe it’s referring to water skiing?