@laurette_dkhar says:
It's a word I use frequently. Depending on the context, it means many things.
1. Terrifying. (A mishap can be shyrkhei)
2. Threateningly skilled or proficient. (A person can be shyrkhei at, say, a sport.)
3. I use it as an exclamation for comic effect for the most part. For example, if someone has said something ridiculous. That ridiculousness is shyrkhei.