Sizzle sounds like the noise something makes when it sizzles, and is therefore an onomotopaeia. Other examples of this would be words like ding, moan, or chirp.
of or pertaining to a person who is bad at fitting a sound with the appropriate representational word, or onomatopoeia.
Hey, have you heard that commercial where the jingle goes ching ching at the beginning?
Nah dude, its definitly dahh dahh, you're just onomatopoeiaexic.