In electoral systems which use ranked voting, a donkey vote is a cast ballot where the voter ranks the candidates based on the order they appear on the ballot itself. Wikipedia

Vote in a ranked preferential voting system in which consecutive numbers are listed in the ballot order Wikidata

The act of casting a vote, in an election using a preferential voting system, by specifying the candidates in the order in which they are listed on the ballot paper (i.e., by numbering the choices sequentially from top to bottom, ignoring what they represent); a vote so cast. Wiktionary