From: Albuquerque, NM
I've wondered about this myself for some time. Couldn't find it as an acronym and didn't look further until your question and I'm glad you asked. Found this at "https://www.boardgamegeek.com/thread/1958317/wego-game-system" and it refers to player interaction: "I go then you go" vs "We go together".
As opposed to IGO-YUGO this is a game system where each player issues orders/commands to their units/assets at the same time, the action then executes simultaneously with no external player intervention. It's popular with computer wargaming these days. Question, the only board wargame system I know that uses WEGO to some extent are simultaneous move systems which are not technically WEGO games and had their day back in the 80's, Operation Crusader(GDW) is the only one I am familiar with. Are there any other board wargames that employ WEGO mechanics?? In theory, I think WEGO games are the way to go, especially with tactical gaming.
Hoped this helps, it did explain things for me!
There are quite a few wargames that use WEGO. Flashpoint Campaigns, Combat Mission, all of the AGEOD titles and others I'm forgetting at the moment. It works pretty well.
You and the rest, you forgot the first rule of the fanatic: When you become obsessed with the enemy, you become the enemy.
Jeffrey Sinclair, "Infection", Babylon 5