Possible Clues:

• Special language
• Shop talk, maybe
• Techie talk, e.g.
• Techie talk
• Conflict with past when speaking a special language
• Pint finished, cut short technical chat
• Professional gibberish
• With its big mouth, has it gone, in a manner of speaking?
• Bandied words, possibly, as pint's almost finished
• See 15 Down