an evolved version of the word 'timmy' used in the popular television series southpark by a handicapped child named timmy. The word 'timmoi' is used to describe a person (handicapped or not) who is acting like a retarded or handicapped person on purpose or not.

A person injuring themselves or failing to pull off a procedure whilst attempting a stunt or activity may be considered a 'timmoi'

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.