1) Defined as an asshole who thinks it would be funny to take a massive shit in a public stall and then not flush. The aforementioned "asshole" waits at the sink to see the reaction of the next person who walks into the stall.
A person that gets caught looking thru the slit in the toilet stall door and then comes back to look at you for a second time
Dude, I was on the crapperdropping a deuce and I noticed a stall-eye. A few minutes later I noticed that the stall stalker had returned to scene of the crime for a second look.