Generic Geek t-shirts | Not Safe For Work NSFW t-shirt
Are you not safe for work? Do you need more professionalism?
If the first is true, but you don't care for the second, perhaps you should be wearing this NSFW (Not Safe For Work) t-shirt around your workplace. The IT department would know what it means, anyone else may be a little less knowledgeable about what the NSFW abbreviation really means.
I'm sure if you work in IT you can generate some sort of technical meaning for NSFW...