Niall Horan's penis sparks Twitter frenzy after singer grabs crotch during opening Where We Are tour

Niall Horan managed to kick start a hashtag that will 99.9% make you blush.

On Friday night the boys kicked off their Where We Are tour, and their loyal army of fans pretty much hijacked the whole of Twitter while it was on. They kept us up to date with the set list, mid-show toilet requests,  and, erm, what Niall and his private parts were up to.

A video shows the Irish crooner jumping around stage and pulling some robot moves before he sings "you make me wanna..." while rubbing his crotch area. According to fans that's what sparked off this rather dodgy hashtag - #NiallTouchingHisD**KHadMeLike.

A fan wrote: "It's the first day and we trended this. Ladies and gentleman the one direction fandom is back." And we dread to think what else they could get trending.

Harry, Niall, Zayn, Louis and Liam took to the stage at the El Campin Stadium in Bogota for the first show as part of their epic Where We Are stadium tour. Every One Direction fan on the planet apparent absolutely loved it judging by the explosive Twitter reaction – and so did Liam.

Shortly after the show wrapped, Liam wrote these rather strong words: “The greatest experience of my life.” While Harry shared: “Columbia, thank you so much. You were the perfect way to start a tour. It’s been a while and you were incredible. Love."