Definitions of sod:

• noun:   an informal British term for a youth or man

  Example: "The poor sod couldn't even buy a drink"

• noun:   surface layer of ground containing a matt of grass and grass roots
• noun:   an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen
• noun:   someone who engages in anal copulation (especially a male who engages in anal copulation with another male)
• verb:   cover with sod