等等 is the reduplicated form of the verb 等 (to wait), meaning 'wait a moment' or 'hold on'. It's used like 等一等 but more casual. Separately, 等等 also functions as a phrase meaning 'and so on' or 'et cetera' when listing items — this usage is not a verb, but the row's POS is verb, so the examples below only show the waiting sense.