The phrase "go off wall" can be replaced with several synonyms, depending on the context. It can mean to become angry or upset, in which case phrases like "lose it", "blow up", or "flip out" can be used. If someone is acting strangely or irrationally, synonyms such as "go crazy", "act nuts", or "go bonkers" can be used. Alternately, it can mean that a situation has become chaotic or out of control, in which case phrases like "spin out", "implode", or "come undone" can be substituted. Regardless of the synonym used, the underlying meaning is that something or someone is behaving erratically or unpredictably.