Hepatitis BD is a severe case of Hepatitis, BD is short for Big Dick.
Person 1: Hey man I gotta tell you something serious
Person 2: Whatâs wrong man?
Person 1: I got a severe case of Hepatitis BD.
Person 2: Oh dang dude, thatâs awful.
Person 1: Hepatitis Big Dick
Person 2: haha very funny.