Are multiplayer (co-op) Borderlands 2 games pausable? I plan on buying the game to play with a friend but the ability to pause is important for us, so I want to verify that first.
No you cannot pause Borderlands 2 if you play multiplayer.
If this is an issue for you, I would suggest that this shouldn't keep you from playing this amazing game.
There are areas that enemies spawn and once killed, they take a long time to respawn. You don't have to go all the way back into a safe town to pause and look at items or whatever.
Playing online, Borderlands does not give you the ability to pause. This is more an inherent requirement for online play. You should expect the same for any game being played over the internet.
That said, the penalty for dieing should not discourage you from taking a toilet break, and unless you right in the thick of things or drastically unequal in level, your friend should have no problem covering you while you grab a drink/go to the toilet/have a cigarette.
That said, if you are playing split screen, you can pause the game, no worries.