When the classic Q*Bert character dies, he says something that sounds like an alien language:
What is he supposed to be saying, exactly?
According to the Wikipedia article on Q*Bert:
[Audio engineer David] Thiel was tasked with using the synthesizer to produce English phrases for the game. However, he was unable to create coherent phrases and chose to string together random phonemes. Thiel also felt the incoherent speech was a good fit for the "@!#?@!" in Q*bert's speech balloon.
According to the original game manual (describing the process of installing your arcade cabinet), when Q*Bert is killed he emits
"Garbled Nonsense Speech".
Long story short, he's rudely cursing his fate.
The nonsense characters in the word balloon are known as "Grawlix", a term coined by Beetle Bailey creator Mort Walker, and are used in comics to denote sour language. The "garbled nonsense speech" is the game's own version of bleeping out the bad words. Cartoons will also use nonsense sounds to cover up the bad words, like the dolphin calls in Spongebob's "Sailor Mouth" to cover the sentence enhancers.
"One of the most unique aspects of Qbert was its implied swearing when players sent poor Qbert to his doom. What he's actually saying has never been revealed, but I'm sure anyone would curse their luck if a snake knocked them off a floating pile of blocks."
I think he is saying "oh crap" or "bad luck" as I have searched it up many times and it sounds like something he would say as "@!)*&@" means hello in his language.