The full form of GOOH is get out of here.
The acronym “GOOH” means the phrase “get out of here.” This phrase can be said when you want someone to leave an area or as an exclamation when something is so preposterous that it is unbelievable. One must pay attention to the context the acronym is being used to determine the manner in which the acronym is being used.

Origin of GOOH
The origin of the acronym “gooh” is associated with the origin of the phrase it represents, “get out of here.” There are several possibilities for the origin of this phrase, from the game of baseball to the stage of Vaudeville. Frankly, no one is quite certain on its exact beginnings. Sometime after the popularity of online communications and texting exchanges, a lot of the phrases that were used in conversation were reduced to acronyms like “gooh” to make it easier, quicker and more convenient to type.

Example Conversations
A text exchange between two friends.

Friend 1: Hey! Guess what?
Friend 2: What?!?
Friend 1: I got my acceptance letter today for college!!
Friend 2: GOOH! That’s awesome! Congratulations!