Sastrugi are sharp irregular grooves or ridges formed on a
snow surface by wind erosion, saltation of snow particles, and deposition, and
found in polar and open sites such as frozen lakes in cold temperate regions. But this really isn't the point.
More fun is to just drop the word randomly into conversation, showing everyone you might know stuff.
Example: The chicken was a bit too sastrugi, so I didn't eat a lot of it.
Result: Wow, I didn't know you lived in Zurich.
For academics and serious amateurs, when having a conversation about winter sport, squint and look toward the horizon, muttering, "sastrugi." The benefits will be obvious.