"
salty peeper" is an old
English phrase referring to when a person gets semen in their eye, with "
salty" referring to the typical taste of semen and "peeper" referring to the person's eye, thus their peeper is being described as salty.
Last night, I was watching some
bukkake porn and the girl got a bunch of semen in her right eye, then one of the
guys said; "woah, would you look at that salty peeper!"