Senses
骑驴觅驴/ 騎驢覓驢 to look for what one already has
literally to search for a donkey while riding one; used to describe forgetting what you already have or looking far and wide for something right in front of you
骑驴觅驴/ 騎驢覓驢 to keep a job while looking for a better one
to search for a better position while already employed; to seek better opportunities without giving up current ones