Simplify the following text for a Grade 11 native English-speaking person.
Original: In the indigenous language , participants called it iki haveve , or `` belly-don ' t know , '' meaning , roughly , `` dizziness . ''
Simplified: In the indigenous language , people who were taking part in the Vailala Madness called it iki haveve , or `` belly-don ' t know , '' which was another way of saying `` dizziness . ''