Atrial fibrillation, now thats 2 words i know nothing about but i bet if i told one of my buddy's i had that he would say something like " DID YOU MAKE IT TO THE TOILET SON? "
It means that your heart speeds up to 130-140 BPM and loses its rhythm completely. It doesn't empty out the chambers and your risk of instant stroke skyrockets. Believe me, you don't wanna experience it first hand.