From Longman Dictionary of Contemporary Englishdon’t go theredon’t go therespoken informal used to say that you do not want to think or talk about something ‘John and Clare having children?’ ‘Don’t go there!’ ‘What if the two of them ...?’ ‘Don’t even go there!’ → go
Examples from the Corpus
Don’t even go there• "What if the two of them actually..." " Don't even go there." 