Shiv out

To pretend to be drunk to avoid drinking

or

To run away from ones own stag party leaving all of your friends to worry about you, so that you can watch house of cards season 2 on NetFlix

1 "How was the stag mate ? Awesome until the stag decided to Shiv out"
2 "Is he drunk ? Nah mate he's been shivving us all night get some shots into his eyeball"