When Irish UFC Featherweight contender Conor McGregor was asked during an SI Now appearance today whether or not he could beat up popular Irish WWE Superstar Sheamus in a real-fight, McGregor replied by saying, “I would whoop his ass. It would be no contest.” Shots fired!

Of course a proud Irish tough guy himself, the WWE Superstar was quick to take to social media to fire back at the “The Notorious” one.

Below are a series of back-and-forth tweets from McGregor and Sheamus, who took the trash-talk one step further.

Had bigger dumps after a salad @TheNotoriousMMA lad. U can hold @BrockLesnar‘s @WWE title while the big boys duke-it-out. Win @ufc title 1st — Sheamus (@WWESheamus) November 21, 2014

NOTE: The two weren’t done yet, as they were only getting started! To read the rest of their back-and-forth trash talk, which gets turned up a notch, click below to advance to page two