Gibberish is actually an understatement. The use of meaningless words has been condemned in the whole of 1 Cor 14, from verse 1 all the way to the very end. But it seems majority of the ears are deaf. For your sake i will pinpoint and summarize 1 Cor 14.
1 Cor 14:
1 Follow the way of
love and eagerly desire gifts of the Spirit, especially prophecy.
In case you forgot what love entails:
1 Cor 13:
4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud.
5It does not dishonor others,
it is not self-seeking, it is not easily angered, it keeps no record of wrongs.
6Love does not delight in evil but rejoices with the truth.
7It always protects, always trusts, always hopes, always perseveres.
IOW, your tongue can only be termed as genuine gift from God if others understand what you are saying for
their benefit (and not yourself -self seeking). This is the way of love. Love is always about others and never self.
If your tongue is not understood by others, then it doesn't originate from love who is God. If it doesn't originate from God then you know who.
Do not quote for me 1 Cor 14 vs 2 and talk to me about self-edification. There's no such thing as self-edification, it is selfishness and the wrong that Paul was correcting in that letter.