For reference, I finally caught this episode the other night and got the exact wording of the comeback. A bit of a background, George is eating some shrimp in a meeting and his co-worker Reilley teases him about it. George later thinks of the perfect comeback, and sets up another meeting where he can scarf down shrimp to have a chance to use it.

Reilley: Hey George, the ocean called, they're running out of shrimp.
George: The jerk store called, they're running out of you.
Reilley: What's the difference, you're their all time best seller.
George: (Pauses) Yeah, well I had sex with your wife!
Boss: (stands up) His wife's in a coma.