Congratulations
You use the power of your mouth to spit shellfish at people as a form of congratulations! In fact, you yell "CONGRATULATIONS!" as the shellfish come pouring out of your powerful mouth.
Shellfish were once used as currency, so this totally makes sense. Just think of the shellfish as money coming out of your mouth as you say your congratulations.
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When you say congratulations like this, you look just like a gargoyle (が). You're crouching down, your mouth wide open, just like a stone gargoyle.
The next time you're congratulating someone, assume the gargoyle stance and dump all of their congratulatory shellfish on them from your mouth.