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A slang term used in various forms to describe something as terrible. Commonly used as a derogatory remark against someone when they're being highly tedious and/or annoying.
Guy 1: "Oh man, this Sex On The Beach is so tasty and the umbrella really compliments my hair colour"

Guy 2: "Dude, you're so blaith right now, it hurts."
Blaith by Reagansmash1994 November 27, 2012
Related Words

Blaithin 

Blaithin is literally the most amazing person ever. You can try, but you won’t ever meet anyone quite as good as her. She is kind, caring, compassionate, sweet, loving, thoughtful, loyal, and has many more wonderful qualities. Bláithín is so strong and can get through anything. She is friends with practically everyone, and she can mingle and fit in to any crowd. She is so generous and would do whatever it takes to make her friends happy. Bláithín had the face of an angel. It is so beautiful you’d think it was specially carved by the most talented artist. And her eyes are the most precious things imaginable. Like crystals. Usually green-ish and beautiful. Easy to fall for. She loves exercise, adventure, horror movies, Ben and Jerry’s ice cream, and of course Netflix. She has watched everything on there. Everything. She can be quite stubborn and slightly moody at times, but she’s only standing up for what she believes or standing up for a friend. She always supports the greater good. She is the best of fun. With her beautiful face, voice of an angel, lovable personality, you would fall in love instantly. We love you Bláithín
Omg look it’s Blaithin!
Blaithin by RIPJughead;) June 21, 2018

Blithering idiot 

Basically, James May and Richard Hammond when they talk to Jermey Clarkson
Hammond you blithering idiot, you totally ruined this car!
Blithering idiot by Goh nakhor September 27, 2019

to blathe 

But that's not what he said! He distinctly said 'to blathe' and as we all know 'to blathe' means to bluff! Ah, and you were probably playing cards, and he cheated!

blithering idiot 

Someone highly unsensible. A highly annoying person. A babbling idiot.
blithering idiot by Catwisperer November 26, 2016