Speaking in Tongues

I heard some douchebag on the radio talking about Jesus and blabbering nonsensical syllables and thinking it was OK because he was speaking in tongues. Aside from being asinine, I have one more problem with "speaking in tongues:" nobody knows what you're saying!! The original goal of speaking in tongues was during the Pentecost when Jesus's apostles spoke the word of God and everyone COULD understand what they were saying. (See Acts 2:1-12).

I don't know what good mimicking baby talk does when goofballs are trying to preach, but there must be some sort of audience that this appeals to. I want to know: does anyone understand this gibberish? Is it considered some sort of gift to invent ways of putting sound together that don't have an interpretation to the listener? What if I said oohgawadio? WTF?