Please check out this adorable blog, 18 Everyday English words that come from Irish.
When I read the origin of Gibberish, and the meaning...I had to laugh out loud. Being Irish myself, I am not offended in the lest bit. I think there tends to be a grain of truth behind two things: stereotypes and jokes. But then again, most people who know me also know that I am an equal opportunity offender. I have a little bit for everybody.
18 Everyday English words that come from Irish explains that the Word Gibberish, is an Irish word that the Irish had to come up with to explain talking while drunk.
"Gibberish" could be from the Celticgibber, or the Gaelic gabairechd, meaning unintelligible talk. It could even be a play on "gob" or "gab. ":
Enjoy the video.... Drunk talk needs translation. People tell me that I am funny when I drink. My sense of humor is pretty weird when I am sober, so they are probably right. This video makes me want to stay sober - 4-EVER.