# Now this man

The words "this man" refers to Judas Iscariot.

# the earnings he received for his wickedness

The words "his wickedness" refer to Judas Iscariot's betraying Jesus to the people who killed him. 

# there he fell headfirst, and his body burst open, and all his intestines poured out

This suggests that Judas fell from a high place, rather than just falling down. The fall was severe enough to cause his body to burst open. Other passages of scripture mention that he hanged himself.