The whole thing went down when he was in the middle of performing his own holiday-themed song "Christmas Eve." He apparently forgot the lyrics and dropped the f**k word in front of the audience.
As seen in a video from the performance below, the Biebs belted the track from his 2011 Christmas album Under the Mistletoe while being backed by acoustic piano. Halfway through the 30-second clip, he stopped singing and spoke into the microphone, "What the f**k are the words?"
The audience erupted in laughter before JB went into the second verse. Swaggy?
Boy said "what the fuck are the words?" While singin a Christmas song to a bunch of white people... Bieber a savage pic.twitter.com/AQnNSPFQLr— ⠀ (@_ASAPLAME) December 9, 2015