A set of circumstances too incomprehensiblly strange to either be real or manageable.
"When I tried to contemplate the concept of a naked Ainsley Harriot, covered only in butterbeans and with his genitals coated in lemon curd and fruit pastilles, weilding a bottle of fairy power spray and breastfeeding a newborn lamb, whilst being pursued by a herd of florally minded bee-chimps, my mind went into complete bizarreverdrive."
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.