For instance, you are actively on dating apps while in a committed relationship; creating/seeking romantic opportunities outside of your partner/spouse.
Adjective applied to a student who tries to get out of a summer homework assignment by "thinking" it was optional.
It rarely works but might get you permission to hand the assignment in late.
Teacher, "Where is your summer book report?"
Student, "Uhh... I thought that was optional."
Teacher, "How optionalistic of you."
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.