I think they're inappropriate for work or school. I get they're for a good cause, but you know what? You can show support for a good cause in a way that doesn't use slang for body parts.

I wear a pink plastic bracelet in support of my husband's cousin who is a breast cancer survivor. It says "Eradicate Breast Cancer" on one side and "Texas Tough Gal" on the other, with her name and nickname on the inside.

If it had the word "boobies" or any other slang for a body part on it I wouldn't wear it.
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Rock on with your bad self.

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Be excellent to each other. ~ Abraham Lincoln

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