Wasn't there a Tippy's Taco around there someplace?
I don't think there's one around there. Some in the area have closed. Most of the NoVa franchises were owned by the father of a friend/co-worker of mine. We always joke that she's the Tippy's heiress
Needless to say, she still keeps her day job just in case.
I do have their guac recipe however, one fringe benefit of the friendship.