When people throw out a "gg" to me before the game is over it has usually meant they are stupid, thinking they have won they game when it's exactly the opposite. And yeah it is rude.
someone who's delaying the game is very unlikely to stop simply bc he's asked
Nah, it depends on how you ask. Be polite about it and they usually do surrender (talking about people who have not realized they have lost, not stallers)
Edited 5/7/2015 07:40:06