Something that is so loud it's obnoxious. Can refer to sounds or sights considered loud.
Man, when Chad's phone started going off we all jumped because he hadn't adjusted the ring tone volume and it was totally loudnoxious.

Omg, whoever's loudnoxious car alarm keeps echoing in the covered parking lot needs to shut it off because it's giving me a damn headache.

Woah, don't look directly at Gary's suit - that neon plaid blazer and neon striped trousers are so loudnoxious together they'll burn your retinas.
by St. Furn Obnox March 29, 2017
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