Philosophy
Put an axe in your mouth with your fingers to express your philosophy. Your philosophy of putting weapons in your mouth. Everyone else seems to think it's a stupid philosophy, so you're showing them that it's not with actions!
Imagine expressing your philosophy, your deepest thoughts and beliefs, by putting it in your mouth.
てつ
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Your philosophy on weapons in mouths means you're always tasting 鉄 (てつ). They say blood tastes like copper, well weapons taste like iron.
Your philosophy and your way of life means everything tastes like 鉄 now, and you think everyone should be that way.