One-man teams
Teams whose fate is perceived to be entirely tied to the scoring abilities of one player (who need not actually be male). The term is usually mildly derisive, used to imply that the star player is good at getting tossups (especially at the end) but cannot provide the depth on bonuses needed to win big games. These teams cannot usually succeed against well-balanced attacks from multiple good players at the highest levels of either high school or collegiate quizbowl.
Because of the derogatory connotations, and especially the implied insult to the teammates of the "one man," it is not a good idea to use this term in reference to teams in your tournament when you are the TD or moderator.
Literal one-man teams are sometimes seen in collegiate play, and are a different phenomenon entirely and one of which new teams should be very afraid.