Pic: UFC contender Conor McGregor gets into Irish Twitter war with top WWE wrestler Sheamus

Ultimate Fighting Championship (UFC) featherweight contender Conor McGregor was a guest on SI Now earlier today (Fri., Nov. 21, 2014) and the "Notorious" featherweight was asked if he could defeat WWE superstar "Sheamus" in a real fight.

His answer? "I would whoop his ass. It would be no contest."

Then this happened.

ok @SInowLIVE @ufc @TheNotoriousMMA, Conor wins. I don't hit featherweights or shoeshine boys. Mouth off to @BrockLesnar fella, I'm injured.

— Sheamus (@WWESheamus) November 21, 2014

@WWESheamus, @BrockLesnar fought PURE, phoney. Me and Brock Vs You and any shmuck of your choice. #CelticPhoney #TagTeam @JRsBBQ @WWE @UFC

— Conor McGregor (@TheNotoriousMMA) November 21, 2014

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

@WWESheamus @BrockLesnar @WWE @ufc Careful now scaldy, you will wake up with no teeth and your nose on my mantle. #CelticPhoney #NeverFought

— Conor McGregor (@TheNotoriousMMA) November 21, 2014

Phoney? @TheNotoriousMMA @BrockLesnar @WWE @ufc haha that last lad you 'knocked-out' went down on the breeze of a punch... #NeverConnected

— Sheamus (@WWESheamus) November 21, 2014

@WWESheamus @BrockLesnar @WWE 'Never connected' sounds more like your game. You wear ball stranglers and slap mens asses for a living.

— Conor McGregor (@TheNotoriousMMA) November 21, 2014

Whereas you talk for a living son & we all know who's ass @TheNotoriousMMA is kissing nightly. #LittleManBigChip

— Sheamus (@WWESheamus) November 21, 2014

@WWESheamus I'll whoop you at your own game, then we can toast a whiskey and talk about true fighting. Always remember #UFCAsRealAsItGets

— Conor McGregor (@TheNotoriousMMA) November 21, 2014

Whiskey in Dublin this Christmas @TheNotoriousMMA. Shirts on the deck, back-to-back, and we'll fight everyone. #TraditionalIrishChristmas

— Sheamus (@WWESheamus) November 21, 2014

Sheamus stands 6'4" and weighs roughly 270 pounds.

Predictions?

Thanks to Geno Mrosko at CageSideSeats.com for doing all the legwork. See more of this story here.