someone who is all up in your bussiness and thinks you don't notice.
Two people are having a private conversation and notice another party is listening. The word "Cornstalker" would be obnoxiuosly yelled out by one of the Two people having the conversation making the other party aware there is someone all up in your conversation.
A stalker who uses IM exclusively with the ultimate intention of using an ear of corn to give pleasure in an uncouth manner to the target.
1: When I saw him randomly talking about Indian music over IM, I knew he was a cornstalker.
2: As I felt the bumpy sensation in my posterior, I realized he was a cornstalker.
3: He was tried on many charges including that of being a cornstalker