You can be coy all you want, software named BIGFATCOCK isn't going to be used in K12 setting or government/corporate environments in English-speaking countries, and neither is GIMP.
To get things out of the way: BIGFATCOCK does not mean anything offensive in languages other than English, and there's nothing wrong with big, fat cocks.
It's just a bad name for e.g. spreadsheet software, as the established meaning of the name has nothing to do with the functionality of the software.
Same with GIMP. You can stick fingers in your ears and scream "la la la" all day long, and wonder why GIMP isn't picking up steam like Blender did for the next 20 years — your call.