Gately's hospital visitors (p. 819)
Bruce Green had rammed Lenz up against Pat’s cabinets and shaken him like a margarita, but refused to rat out Lenz or say why irate Canadians might think a specimen as dickless as Lenz might have demapped their friend.
Context
Calvin Thrust at Gately's trauma-wing bedside, recapping the night of the shooting. First hit of the scene's six-hit cluster: the Nucks' dead friend enters the conversation already in the idiom — whether Lenz "demapped" him is the open question Gately can't ask aloud.