What does "stay out of uncap" mean because I got that pop up on my screen a couple of times but didn't have a clue what I was supposed to do.
It means don't enter the enemy spawn points (i.e. on conquest it is the furthest back flag on the other team which u cannot capture and in Rush if u are defender u can't enter the attacker's spawn point). Most servers have a problem with this on Conquest, less so on Rush.