That is the question.
Hodl is just the word HOLD misspelled and it started from this post
There are very good reasons to Hold bitcoins, this article shows 7 reasons and they are very good, from the financial point of view.
In my view, the fact Bitcoin is decentralized and you can transfer something of value without a main central hub or bank can be revolutionary.
We can have a future which we don’t need a bank or a third-party in between a transaction of value. That is a scary but good future.
Naval give one of the best tweets regarding Bitcoin. In few letters than me.