Mia – “Missing in Action”. This means that an opposing champion who is laning has disappeared from the lane. Sometimes that champion has gone back to buy gear or heal up, but no one on the teams knows the champion’s location. That means that the missing champion may be setting up for a gank.
Mid – This refers to the middle lane. If said without anything else, then the champion saying it is heading to the middle lane to defend, level, or gank. “Solo mid” means that they wish to level lane by themselves. This is done by a number of champions, but Ashe is the most common solo champion in the middle lane.
Push – A call to push is often followed by a specific lane. That means that all champions should gather up and go together up a middle lane to try to get as many towers down as possible, or towards the end of the game, it may be a push to control the opponents’ base.
Re – This means that a missing character is back or has returned.
Top – Top refers to the left side of the map regardless of which side of the map champions spawn. When stated alone, the champion is letting others know that he or she is headed to the top lane.
Tower dive - A tower dive is when champions that are laning go for a tower regardless of the consequences. They do not follow behind minions, nor do they play with the usual caution when dealing with towers. This usually occurs when a champion’s ultimate is up and allows for increased defenses against towers.
Ult – Short for “Ultimate”, ults are the most powerful ability for any given champion. Ults are not obtained until a champion reaches level 6 and often determines how aggressive the opponent will be. If a player calls for an ult, he or she is likely speaking to a laning companion, and they are preparing to strike the opposing champions. “Ult up” refers to the fact that a champion’s ult is ready to be fired.