You would call someone "garbongo" when they are clearly wrong.
Garbongo means that something or someone are lower then trash and deserves to be burned like the filthy garbage they are
"Gatering" someone is defined by looking in the eyeswith a smileon your face while missing a minimum of 85% of your teeth. Also, in order "to gater" someone you have to have at least one major handicap or abnormal genetic disfunction - such as having a third eye. Gatering someone online describes the constant spam and annoyance, usually via manga or anime related internet links and memes, of a friend.
He just gatered me sending a gif of a cute looking japanese girl from an anime. He then asked me on voice chat, although I couldn't understand him because of his mumbling (due to lack of teeth), wether or not I would like to watch an anime with him. I hate him when he is gatering.