To flex on people for no apparent reason just because his self esteem is extraordinary low. He also may he tendencies to swear, be violent, and to step on other peoples shoes just because he is a massive dick, but that doesn't mean he HAS a massive dick.
"Bro, these are new shoes, you don't have to go pull a Riley on me!"
To pull a Riley is to do something super cool like accidentally making a pattern on the flash game "Circle The Cat".
You can also pull a Riley by making really really funny puns or by just being super rad.
"Man, did you see the way Panayiota circled that cat, the pattern was pretty groovy, she's totes going to pull a riley."
To interrupt an ongoing, text-based, conversation by sending a screenshot of little to no connection to the topic at hand, thereby disrupting the flow and leaving everyone confused.
A: Did you read the chat from yesterday evening? It was hilarious, everyone was having a blast!
B: Yeah dude, it was great. Until someone sent that pic of their Clash of Clans base, why did they have to pull a Riley like that?
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.