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First, that is not an onomatopoeia. A slap does not sound like the word slap. Second, this technique is ineffective either way. You can't turn up the volume in prose using caps and asterisks. Nor...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/25599 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25599 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
First, that is not an onomatopoeia. A slap does not sound like the word slap. Second, this technique is ineffective either way. You can't turn up the volume in prose using caps and asterisks. Nor can you do sound effects. This is the page, not the screen. All words are read as the same speed and volume. To make any moment dramatic or surprising, you have to set it up properly.