An impulsive exclamation uttered in response to either a ridiculous comment that presents an awkward situation or a misfortune that befalls a person.
Chaz manages to find himself in an awkward position while at a party, and rather than help him out, his friends laugh on his behalf and go "Zaaaaa!"
An otherworldly creature that shouldn't have the liberty of walking amongst mere mortals due to its actions or words.
"Go make me a damn sandwich, you godless serpent!" The godless serpent releases an uncontrollable struggle and proceeds to complete its duty.