Fart bombs are these bags with this liquid inside a small packet, which you squish , then they react to produce hydrogen sulfideand then the bag pops and a rotton egg smell fills the area.
this is when your little brother lucas goes to the bathroom at three a.m after eating nachos all night long and poops so hard he could clog seven toilets and a cat. this usually results in sending him off to an orphanage or area 51 while the rest of the world tries to clean up the nuke that just went off in that bathroom