The character directed the word at Derek Branning as he accused the gangster of having an affair with his wife Kat.
Countryfile presenter Julia Bradbury wrote on Twitter: "The word 'shagging' used on EastEnders seems to have caused quite a pre-watershed stir this evening....?"
Users of the social networking site went on to ask whether the word should be featured on the show.
According to The Sun, 'shagging' trended on Twitter during the evening.
The newspaper quotes a BBC insider as saying that the word had been said before on the long-running soap and that there had been a total of 45 complaints from viewers.