COFIWCH DRYWERYN!

Looks like some Welshie scamp has been trolling the internet by including the 'Slogan' Cofiwch Dryweryn in an article about Celtic words being used in English. 

Firstly, in the word map at the head of the article, mixed in with other Celtic sourced words 

Then again, later under the section about the etymology of the word 'Slogan'

I wonder how many Anglophones realise that this slogan means 'Remember Tryweryn'?  A rallying cry for Welsh nationalists asking the reader to remember The Welsh village drowned to make a reservoir to supply water to English Birmingham.

From :-

10 English Words You Didn’t Know Had Celtic Origins | The collector