Watching a Czech football game with my roommate and there is an ad for "fatfuck". What's up with that?

My roommate and I (American) are getting into football after watching the world cup and we are currently watching a game between AC Sparta and FC Zbrojovka. I noticed a scrolling ad(?) on the screen that goes around the pitch that just says "FATFUCK" which is a very offensive or insulting phrase in English and we were wondering what that is about. Is it a local brand or does it translate to something else in Czech?