An ex-boyfriend of Mexican ethnicity, specifically an immigrant from the country of Mexico. A shortening of "Mexican ex-boyfriend." Used by whites in a self-deprecating way, as in a girl who has a Latin fetish, for example, and usually not meant in a derogatory or anti-Mexican manner. See also Nexican
Susie: "I've got to find a new boyfriend. Things have been dry around here since the Exican and I broke up."
Jennie: "I know a good-looking bartender. He's a good potential Nexican for you, Susie."
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.