Fundoshi

The T piece is stuck and cannot kick up, only rotate once left or once right.

In ARS, a fundoshi is a situation where a hole is forced in 20G because the T piece cannot be be spawned with the flat side pointing downwards, even through the use of IRS. This happens when there is a 2 unit (or more) deep hole in the 5th column. The name comes from the visual similarity with the traditional Japanese bathing suit fundoshi. The walls on either side of the 2-deep hole resemble the legs, and the T piece resembles the backside of the garment.

In Terror-Instinct the T-piece has the ability to kick up when rotating, and can be unstuck from a fundoshi.

The imagery of the fundoshi is adopted as a logo for Pier 21's long-running The Masters tournaments, using the image of a sumo wrestler's butt. Despite this popular imagery, which technically is a related garment called a mawashi, players refer to this situation as a fundoshi rather than a mawashi.