Carl Wheezer is the anxious, allergy-prone best friend from the animated series The Adventures of Jimmy Neutron, Boy Genius, and his hesitant, questioning delivery became a recognisable part of the character. Clips of his voice were later lifted for short-form videos and meme edits, where the single huuuh works as a quick punchline for confusion or disbelief. It circulates alongside other goofy ahh sounds because it needs no context to be understood, and creators keep reusing it for reaction videos, gaming moments and awkward edits.