When your psychiatrist has you on such an exotic blend of medications, that you begin to wonder if you are the the half-way mark between animal testing and human trials.

Being so loud/crazy/out of control/obnoxious that one can be described as a primal animal; chimp.

Chimp Out refers to the action of someone or somthing(chimpanzee) going completly ape shit on anyone who tries to calm it down. The person or thing completly looses his or her cool for an extended period of time. In extreme cases resulting in police "busting a cap in its ass".

What rednecks/Trump Supporters/Neo-confederates do on a daily basis.

To Sand-Chimp out is when a middle eastern or Pakistani person (usually Muslim), removes his/her façade as a civilized human being and releases his/her Inner Sand Chimp; as in to start shouting about Allah, The Quran, "death to America!!", throwing shoes around and blowing themselves up, Basically to burn flags, behead people and marry a 12 year olds.

A White Chimp out is when a white person removes his/her facade as a civilized human being and releases his/her Inner White Chimp; as in to start acting violent and out of control. Basically to start TNB'ing; randomly Jumping/beating someone, murder, rape...you know, the typical.
I was trying to reason with that client, but all of a sudden he chimp out on me and started screeching, became violent, and started beating random people around. We had to call the police to control him.

When Curtis and Henry Finley squad up and knock the fuck out of you