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1.
When the singer in the band neglects his duty when it comes to packin' shit up and goes missing. Then conveniently returns when all the gear is packed up and says he was "networking".
Bass player: where's the singer?

Guitarist: What a shirking bastard!
by Betamax August 29, 2014
 
2.
avoid or neglect (a duty or responsibility):
no object, usually with negative (shirk from) be unwilling to do (something difficult):
she is neither shirking nor lying
by Don rajah December 03, 2013