Creeper
Hostile mob
Example

Creeper character from Minecraft
Related Slang
Usage
Last Updated: April 13, 2016
A socially invasive person
A creeper is a weird, socially awkward person who has creepy interactions toward another person. This person often creeps into your social space and is unaware of how creepy he or she is acting.
Creepers are usually thought of as males because their presence is more alarming and threatening to females. However, there are a substantial amount of females that can up the creep factor. Some creeper traits include staring at someone IRL or making inappropriate comments on a person's pictures or social profile online.
Example
Creepers can get real weird especially at the office
Related Slang
Usage
Last Updated: August 1, 2016
A Creeper is a mob in the game Minecraft that sneaks up on players then explodes.