I don't know, but this person filled out one of those lengthy profile things, so I hope they didn't do that with their smart phone. But that is one possible explanation. I asked her about it, so still waiting to hear back.
Which actually brings up an interesting idea about how words evolve. Now we have to consider that piece of shit software could be doing part of it. One day, we may start using these annoying variants.
So I'm currently voting for poor proofreading as no one would associate the word "dumb" with something they liked I don't think.