More on Talk Shop from Infoplease:

• Talk Shop - Talk Shop (See Shop.) Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 Related ...
• shop: meaning and definitions - shop: Definition and Pronunciation
• Shop - Shop To talk shop. To talk about one's affairs or business, to illustrate by one's ...
• narg - narg [Cambridge] Short for “Not A Real Gentleman”, i.e. one who excessively talks shop ...
• Dictionary of Phrase and Fable: T - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "T"