An Orcish Lair can also refer to one's asshole, more specifically a nasty shit-encrusted asshole. The only way to kill the Orcs that inhabit this Orcish Lair, however, is to pierce it with one's elven staff of power.
Knight: The Orcs are gathering their numbers, sire!
Knight: The Orcish Lair beyond the forest!
"Last night I shoved my elven staff of power into this chick's orcish lair. When I pulled it out it had brown orc blood on it. Smelled like rotting orcs, too."