From Sex-Lexis.com (am I glad I grew up without the Internet? . . . ), defined (second definition) as "In love with someone who does not reciprocate."
Used in a sentence, then: The unbaptized woman spent several years hot and torchy over a Catholic man set on mating with a Catholic woman with whom he would sire Catholic children and live out a Catholic existence on a large patch of questionably secular ground located between Catholic heaven and Catholic hell.