Arospike is a romantic orientation on the aromantic spectrum. It is defined as someone who usually feels no romantic attraction, but occasionally has rare and sudden spikes of romantic attraction for an amount of time that can vary from a day to a couple of months before returning to one's normal amounts of aromanticism. Arospike can be a romantic orientation on its own or can combined with other orientations. For example, one could be arospike and homoromantic, meaning that when one does experience romantic attraction it's only towards people of the same gender.
The sexual counterpart to arospike is acespike. Being both acespike and arospike makes someone aroacespike.