Let's say you invested in all good ICOs that have been out so far in 2018. Your investment strategy is to dump right after the token being unlocked and exchanged between people. These folks following this investment strategy are called flippers as we all know.

Another investment strategy is to hold even after the token being unlocked and exchanged between people. You want to hold because you think sell right after the unlocking is way too cheap. These folks are call hodlers.

A harsh but true statistics: Flippers make more profit that hodlers do in 2018. So yeah, 2018 is the year of flippers I guess.