Stream sniping is when someone watches your stream to get an upper hand to essentially cheat against you in a game. For example, they could find your position on an open-world map, find out where your base is, or even find out when you're low on health, so they can ambush you. It sucks. The deveopers of Rust, Facepunch Studios... are (to my knowledge), the first game developers to build a preventative measure against it into their game. They call it Streamer Mode.

A buzz word being used to refer to creators and influencers forming or encouraging unhealthy relationships with their fans. Usually used in the context of young audiences feeling they have a relationship with the influencer due to the huge amount of the influencer’s content they consume. The influencer in question, however, is unaware of the fan’s existence other than the general knowledge of having fans. Common examples include Dream and his stans. These relationships are exacerbated by the influencers confirming they have more than a creator-to-viewer relationship.

The word is circulating due to various YouTube essays about the phenomenon using the word, and therefore people who enjoy complaining about influencers repeating what they heard in the video in any comments section they can find.

Someone who kills Ninja

What streamers yell you when you kill them in a video game

Consists of a 10-15 year old virgin that is trying his/her best to get in a game with a popular streamer such as Ninja Tfue etc and the goal is to kill them and get a great reaction whilst they're streaming they're also watching their stream to see updates such as if the streamer is low health idle or being attacked by others in the game.

A person with no life who decides to watch your awesome tanks 2 stream to gain an advantage on your position and health

2012

Word STREAM SNIPER comes arma 2 dayzmod what is large sandbox zombi survival game where any one can kill any one
livesteamers who streamed their dayz gameplay usually died on the game because playes who are watching the livestream can find them from the map and ambush them and kill them using long range SNIPER RIFLES and kill them whit one shot.

2012
Word STREAM SNIPER have been used on other games where players can watch livestream and cheat agains the game or the streamer

2016
word STREAMSIPER is used when steamer does livestream on puplic and his viewers comes and STREAMSNIPES them IRL (find streamers location from watching livestream)