How am I supposed to know what this means? This is Urban Dictionary, not Dictionary.com. You've lost a few brain cells over the week if you're really here looking for this word.
Who would even use this word in a sentence? Onomatopoeia means... I honestly don't even know.
Onomatopoeia is a word that is used when describing a sound effect.
Here's some example of what a Onomatopoeia would look like:
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Example 1: BOOM! A loud explosion causes your surroundings to shake.
Example 2: BAM! He gets whacked in the face!
Example 3: AAH!! Shouts the lady from fear.