Idiom

[yasihor]

"Dead gurus don't kick ass".What does it mean?

[Casiopea]

IWelcome, yasihor.

In that context don't kick ass means aren't exciting or effective. guru has several meanings,

A teacher and guide in spiritual and philosophical matters.
A trusted counselor and adviser; a mentor.
A recognized leader in a field: the guru of high finance.
An acknowledged and influential advocate, as of a movement or idea.

Source: guru - definition of guru by the Free Online Dictionary, Thesaurus and Encyclopedia.

[Anglika]

"Dead gurus don't kick ass".What does it mean?

A guru (teacher/mentor) who is dead can't reprimand someone who has done something wrong.