This is Goku talking to Bulma who's taking too long to get ready. Translated as: "If you were any slower, you'd turn into a turtle".
おまえ = you
のろ = slow
いなー = いない = ??
亀 = turtle
になっちゃう = turned into (completed action)
ぞ = emphasis
Is いない for "iru negated" or 以内 = less than?