Flop considering the fact that there are two major Pop stars on it and the fact that it's a really radio-friendly Pop song.

did it get at least one official #1 in any country?
it's clearly an underperformance!

According to Wikipedia, it topped Greece, Lebanon and Paraguay. It also topped Argentina´s Airplay Chart

It was Top 10 in:
Spain
Venezuela
Colombia
France
Finland
Mexico
Germany

It was Top 20 in:
Canada
Australia
UK
US

It is also Top 10 in Mediatraffic and had amazing iTunes positions all over the world

It's a moderate hit! But it could get even bigger.

It's not a flop. Sure it didn't set the charts on fire and could have done a lot better, but let's not pretend the song didn't make any sort of impact.

This, people acts like it didnt even chart on the bubbling under when in reality it was a Top 15

Educate these local lessors

moderate hit

It's a moderate hit, stop calling flop to every song that doesn't peak at #1.

an underperformance on a good day. don't even act like y'all weren't expecting a #1 based on those two artist's names alone