1. The place visited when your girlfriend is on her period and thus is reluctant to engage in vaginal intercourse and instead compensates by performing fellatio.
Guy A: Are you and your girlfriend going to bang tonight?
Guy B: Nah she's on the rag so I'm stuck in the dome zone.
a term reffering to the state of mind acheived by injesting one of the several controlled substances that can take you there. Many humans enjoy visiting the dome zone at regular intervals.
dude i'm in the dome zone... (said really slowely)