What is Blindfire?

a term commonly used in airsoft to where a player holds his gun around a corner or over his cover and pulls the trigger without looking

blindfire is illegal on this field!!

Blindfire - meme gif

Shooting 'blindly' over or around cover in an online shooter game. Others also use "blindfire" to describe a kill where they didn't aim/scope.

Jonny: "OH! What a blindfire headshot!"
Jak: "I saw that, it was fackin awesome! I wish I could do that!"