A juice boyce is the event of which a person enters a state of constant uncontrollable vibration (commonly known as a seizure).
Many famous people have died to such occurrences of a juice boyce such as Cameron Boyce From Disney channel & juice wrld. But death is not always an occurrence from these events and many have to live daily with them.
Person 1: Yo where is jeff? ~
Person 2: I think he did a juice boyce
Person 1: Damn so that's why there was an ambulance going down ***** Street earlier