How do you say in the House Greek?

There isn't a single, universally accepted phrase in "House Greek" (assuming you mean the slang used within the fraternity/sorority system) for "in the house." The phrasing would depend heavily on the specific fraternity or sorority and even the individual chapter's slang.

Some possibilities, depending on context, might include:

* A variation on "in the house": They might simply say "in the house," but with an added inflection or emphasis specific to their group.

* A term referencing their chapter house: They might use the name or nickname of their chapter house (e.g., "at the crib," "back at the lodge").

* An inside joke or slang: This is the most likely scenario. House Greek slang is highly contextual and often unintelligible to outsiders.

Without knowing the specific group, it's impossible to give a definitive answer.