A person who feels the need to constantly be in a relationship or to be dating another person. This relationship/ dating usually ends after the honeymoon phase ends
"Did you hear Nicole is dating John?" "I heard, but didn't she just break up with Phillip?" "Yeah dude, that chick is a serial datist!"
A website with a huge quantity of data (much more than what it would appear to be from outward appearance) is said to be hitting you with a datastorm.
Look here Marty!
The main menu of this guy's website reads that the site has an incredible 2.275684417289077 terabytes of user-accessible content! What a fucking datastorm!!!