Aside from online matches, MultiVersus features a number of robust systems, including a Battle Pass, some expensive microtransactions, and the ability to Toast a player in a game!
What is Toasting? It’s MultiVersus’ way of essentially adding “likes” to give to your online buddies and opponents. Using actual in-game “Toast” items, you can give kudos to other players at the end of a match and root them on. Talk about your good sportsmanship, not to mention a cute play on words!
Source: https://www.distractify.com/p/how-to-toast-a-player-multiversus