It's a term that relates to inmate behaviour: bullying behaviour, intimidating behaviour, behaviour that is sometimes related to gang activity. Examples would be an inmate being intimidated into diverting prescription medication, or being intimidated into trying to encourage somebody from outside the penitentiary to be involved in an illegal or illicit activity. It could be muscling or bullying in terms of improperly transferring personal property—canteen goods, etc.
On December 6th, 2011. See this statement in context.