IBS is short for "i bust
shit"
It is a condition that makes you shit too much, and that might make you die. (sourse: trust me)
Many
people have died from IBS, like your mom, my mom, and joe
biden.
Guy 1: "My
doctor said i might have IBS, because i be bussin' too much
shit, and that is
dangerous for my life"
Guy 2: "Damn dude, that shit sucks"