Short, pronounceable and powerful sounding. It doesn't have to mean anything when the domain is so short and easy to say, however:
It could also mean
Buy Unique Video Hits
VH can mean Very Helpful, Valuable Help, Virus Help (Best Urgent Virus Help?), Virtual Hosting, Virtual Hospital, and so much more.
U stands for many words including Ultra, Ultimate, Unique, Understanding...
Many universities starts with the letters BU including: