The boomer is a slow and very fragile special infected, but its a very crucial and powerful special infected. Its primary attack is to vomit bile onto the survivors and attract hordes of common infected onto the soiled survivors, the bile will also temporary blind the survivors. Its special attack is when the boomer is deprived of all its health it will explode bile out, the explosion will also stun the survivors.

Since the boomer is a slow infected most times you have to spawn ahead of the survivors, you can try to find a sharp corner the survivors have to go through or you can jump off a ledge, jumping off a ledge onto the survivors will delay the vomit attack,but the survivors might shoot you from the surprise and trigger your bile explosion.

The boomer is a powerful infected, but it alone is not that strong even if it vomits on all 4 survivors. Working together with other special infected is the best option for boomer users. What the boomer does it causes confusion amongst the survivors and more importantly it creates a great opening for other special infected to kill each survivor off individually.

The boomer has a very noticeable growl and can be easily identified. That is why its very advantageous to spawn at your ambush spot at the last second.

Since the boomer can vomit on multiple survivors at once its best to keep a little bit of distance between each other, but not too much since the boomer is not the only special infected out there. One very important thing is pay attention to sharp corners if u see a boomer arm do not go after it you can try to shoot through the wall of aim the its arm (it is very low on health after all).

When you see a boomer and you know its not going to vomit soon the most crucial thing to do is shove it off and back away for a clean shot at it. Doing this will save other survivors from being caught in the bile explosion. Doing this before or after it vomits are both great, but preferably before it even has a chance to vomit.

When vomited on the best thing to do is throw a pipe bomb as it will attract most of the horde away from the survivors and give the survivors time to regroup. Never throw a bile bomb after vomited on, the survivors that have been vomited on will be the primary targets for the common infected. Another way is if no one has a pipe bomb go crouch in a corner and pul out a melee weapon, this will thin out the horde, save you some health, and you will eventually get you sight back.