Jon Moynihan, a board member of 'Vote Leave', accused 'In' activists of clutching at straws by neglecting to make a positive case for Britain remaining in the 28-nations block.
Instead, he argued on Tuesday's 'Today' programme, they were "trying to create FUD — fear, uncertainty and doubt".
But the term confused many, with social media users north of the border forced to clue Moynihan up on its use as a slang word meaning "vagina".
Source: Urban Dictionary
Twitter users were forced to step in, first to clarify that Moynihan's line of attack may not have its intended impact among Scottish voters, then to mock his choice of word.
@dats A fud, in Scotland, is a vagina.— David Wyllie (@journodave) January 26, 2016
Please someone tell Vote Leave the bad news before the "Don't be a fud, vote to leave" party political broadcast.— Scott Reid ⚡️ (@scottreid1980) January 26, 2016