to blow it in a big way or to make an obviously avoidable mistake
(originating from the Bob Newhart Show, "Hi, I'm Larry, this is my brother Darryl, and this is my other brother Darryl.")
"Les, your post-drinking, late night snack encounter broke our toaster, you just pulled a darryl!"
A boyish-man who constantly argues about sports positions he has little understanding of, sucks at Pokemon and does mediocre solar array designs. He is cute though!
"Did you see that new guy they hired?"
"Yeah, but he's a total Adarryl!"
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.