When a male or female is a creep and keeps sneaking up on you.
Typically the sneaking is done on social networks. Friend requests, pokes, followed...etc. Sneaky texts are also included in this.
The person who is creep sneaking is known as a "creep sneak"
Ex's are usually in this category.
"Man, my ex keep creep sneaking me, he added me on foursquare and poked me on facebook, then sent me a text message! Ugh creep sneak!"