It's just this whole riff through the entire song. 
The tuning is drop c# but you just have to tune down the first string (c#-a-d-g-h-e).

e |------------|
B |------------|
G |------------|
D |------------|
A |------------|
C#|222222-3-0-2|

Just learn the timing. Very easy song but it makes a whole lot of fun :)
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