"Blam" is an intense enough word on its own, and when they add the exclamation mark, it looks like it's being shouted. Most of the time, swear words are just dropped casually, so the intensity of the current swear filter seems misleading. It should replace swear words with "-wort-" instead of "-blam-".
Examples:
-wort- you
That was -wort-ing awesome
English mother-wort-er, do you speak it?
What's up my -wort-s?
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Signed -wort-