Noun
hands-in
(chiefly US, Canada, college, school, amateur sports) A show of unity and usually optimism at the end of an informal huddle of players whereby the players simultaneously extend a hand horizontally towards the center of the circle and then raise their hands in the air with a short team chant.
Chris rallied the team with a "1, 2, 3, Go Tigers!" hands-in and they went on to win the match and the cup.