Phrase used by Robert Downey Jr.'s character in the movie Tropic Thunder. Referring to when an actor playing the mentally retarded goes all out leaving the viewer unable to connect.

A term used to reference cannabis/marijuana/weed.

1) Somewhere you never should go.
2) Playing a mentally handicapped person in a film or show with no exceptional or redeeming skills.

A level of retard you should never, ever go to.

act stupid, moronical or like an imbecile

A full retard is a person that is retarded to a greater extent, or an individual that spazzes out uncontrollably from excitement that would mimic a person with Down Syndrome. A person that goes full retard that is retarded can be incredibly dangerous, as they can generally black out from emotions such as rage if under emotional distress or if they feel threatened they will have a loss of physical arm movements and can feel no pain. If they start winding up a windmill punch and it happens to connect, it can be incredibly devastating, if not lethal, to the individual receiving the blow. A person without the physical retard strength that can go full retard will have a loss of neck control and will make a lot of noise.

to get so drunk that you are no longer a fully functioning human being.