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Tashteeting: Delegating work to an intern.
Nour Wali, Contemporary Art Society

Tatato: A person who spends too much time sitting in front of exhibits in the Tate Gallery
Ian O'Connell

Tatificahan: The art of enforcing office discipline (with thanks to Terry Tate, Reebok)
Vanessa Harding, Accenture

Tedat: To be done now or immediately.
Anon

Teeceearr (tube station): Tottenham Court Road
Anon

The Sluicery: Lower Oxford Street
Anon

The Tomseden: The Hatton
Anon

Tigressive: Sexy business atire (ie. She is pulling a tigressive)
Belen del Amo, Accenture

Tingtingerists: Founders
Anon

Toggelson: A person who gets into their duvet to reduce the heat (tog factor).
Keith Curley, Accenture

Tohoe (noun): A marriage which is the second or subsequent of both partners, with its concomitant Triumph of Hope Over Experience.
Paul Carey-Kent

Toilavoidance: Attending the toilet excessively to avoid doing boring and menial tasks.
Sian Wesley, Accenture

Top Hamgren: Upper Thames Street
Anon

Topsyman: Peters Hill
Anon

Tourybusery: Park Lane
Anon

Transgeny St: Middlesex Street
Anon

Traspector: A tractor spotter in London.
Keith Curley, Accenture

Trenfodulate: To suck up to up to a client.
Susan Ley, Accenture

Tshirka: A person who never makes the tea
Helena Keers, Daily Telegraph

Tubestration: When the tube stops in a tunnel.
Anon

Tubisis: The feeling you get when you arrive on the platform and the train is just pulling out (you've just missed it!)
Brendon Smith, etc venues

Tubspire: To perspire on the underground.
Keith Curley, Accenture

Twistyman High Street: Borough High Street
Anon

Twlop: The World in one place.
Paul Carey-Kent