gaeilge
The ancient Gaelic language of Ireland. It was nearly killed by the English, who treated it like a bad smell. Now it's back because of people who still think it's cool, even if they can't speak it properly.
'My grandpa speaks Gaeilge like it's a second language... but it's not.'
'English is just a fancy version of Gaeilge that got a makeover.'
'200,000 people say they speak it, but I bet most of them are lying.'