A spike is a sudden change, a quick rise in power or price, often sharp and brief. In gender identity, a spike means someone usually feels one way. But sometimes, they feel very different for a short time.
The term can have different meanings in different communities. For example, someone who identifies as acespike is usually asexual. But they may suddenly feel strong sexual attraction for a short time. This experience can be surprising and confusing.
Alex is a person who identifies as acespike. Most of the time, they feel asexual. They enjoy their quiet life. But one day, Alex saw a movie that made them feel different. They suddenly felt a strong attraction to a character.
For a few days, Alex felt this new attraction. It was exciting but also strange. They wondered if this feeling would last. After a short time, the feeling faded. Alex returned to their usual asexual identity, feeling calm again.
Source
https://new.lgbtqia.wiki/wiki/spike