Correct me if I am wrong but my understanding was that wushu could mean several things depending on how specific you want to make the term, by which I mean:
1.) My understanding is that in the Chinese language wushu just means "martial arts" so any martial arts (karate, tkd, BJJ, etc.) would be wushu.
2.) Wushu is often used to mean specificly Chinese martial arts, similar to how Americans use the term "kung fu".
3.) Wushu seems to often be used to refer specificly to the Chinese martial arts that include a lot of flips and fancy kicks and stuff (sorta XMA style).