is also the root of the in , which is used to refer to someone (typically a female) who is rather moody—she's swooning over someone one moment, and knocking him over the horizon the next. Likewise, I've seen as a request for someone (again, typically female in my observation) to stop fawning all over someone.
As to the English word "spoony", that's a running joke resulting from the English translation of Final Fantasy IV.