More than 50,000 posts were researched and analysed on Twitter, conducted over a two-week period to July 7th, using club-specific hashtags to determine which fanbase used the most colourful language.
A spokesman at Paddy Power said: “Now the Premier League is back, it’s been a good opportunity to take a seat on our socially-distanced sofas and become the ultimate armchair fan. And by doing that, it seems it’s been a sweary time for football fans, too.
“Top of the profanity Pops is relegation-threatened Watford, and it’s hardly a surprise that Jose Mourinho is causing Spurs fans to dish out expletives – we can only imagine what their blood pressure scores must look like.”
5. Wolverhampton Wanderers
It's a Europa League place for fifth place Wolves with 5.9% of all tweets containing profane language.
6. Aston Villa
Villa fans, with their relegation threat looming large, are the sixth most profane on Twitter with 5.6% of all tweets containing foul language.
7. Leicester City
The Foxes are running the risk of dropping out of the Premier League top four - and their dip in form is showing with the reaction of fans on Twitter. A total of 5.5% of all tweets containing a swear word.
8. Newcastle United
Tied on 5.5% with the Foxes is Newcastle United, who may be feeling the stress of a potential takeover, which continues to drag on.