"Judas Shuffle" is a knock off of the phrase Cupid Shuffle. Except Judas Shuffle is used in negative reference to a person...
Leaving a lecture or talk before the speaker has completely concluded.
Leaving church near the end of the service or mass but before it has actually ended.
1) Man, as soon as he said, "In conclusion", Half the audience did the Judas Shuffle.
2) Dude, as soon as we started singing the closing song, half the church left.
I know man, Its the Judas Shuffle.