Spasimare means to long for, or to pine for, in a romantic sense. It also means to suffer terribly from spasms, but I much prefer the first definition.  It’s kinda like yearning for someone so badly can give your body spasms.

Example:
‘Quando ero piccola, spasimavo per Brian Littrell dai Backstreet Boys.’ – When I was young I pined for Brian Littrell from the Backstreet Boys.