(Verb) To go boomer: It is a slang term for projectile vomiting onto someone or something. It more commonly refers to a person. To go boomer is a reference to the video game "Left 4 Dead". The game has a kind of zombie that vomits on characters and attracts the Infected. As a whole one never wants to have someone go boomer on them.
When I eat too much I go boomer all over my friends.