This is Oost (This is East, Amsterdam East). Originated from the movie "Blood Diamond". Danny Archer and his Superior "Van de Kaap" are talking about TIA; this is Africa.
Lets trash this place properly, "T.I.O. this is East, welcome!".
In Glasgow Scotland it stands for "Tan In One." For which is a game that everyone is playing all the time and the rules state that the person who calls TIO must have a drink in their hand and everyone else with a drink must finish it in one go.
