It's possible.
Have you read the Gamestop story.
en.wikipedia.org
Now, I'm not sure how its possible to short more than 100% because there are many different explanations on the topic, but I think it has something to do with the situation where a share can be borrowed more than once and subsequently sold short twice !
Here is something to consider though:
"A short position in stocks is created by borrowing stock and then selling it on the market. Therefore, every short position actually results in creating two long positions. The first is the long position from whom the short borrows. The second is the long position created by the person who buys the stock from the short seller. So at any given time, short positions are always outnumbered by 2 to 1."
In my own humble opinion, I consider the art of short selling as a dangerous occupation for those that partake, because subsequent squeezes can be utterly devastating for those holding a bag of shorts. A very clear example of what can happen was the left field Mercedes reveal. Have a look at the chart from Jan 4 to Jan 19, I think 71 cents to $2.34 in two weeks and the volumes were unbelievable, much higher than Fridays bloodbath. There will be another short squeeze at some point in the future as sure as the sun will rise tomorrow morning, and when it comes it'll make the January move look like a Teddy Bear's Picnic.