noun
half tatami mat
Refers to a mat half the size of a standard tatami, or a small space of that size. Also used in the idiom 半畳を入れる (to heckle).
この部屋の隅に半畳のスペースがある。
There is a half-tatami-sized space in the corner of this room.
noun
heckling; jeering; interrupting
Almost always used in the set phrase 半畳を入れる (to heckle, to jeer). The literal image is of throwing a half-mat at a performer.
See also: 半畳を入れる (はんじょうをいれる)
演説中に野次馬が半畳を入れた。
During the speech, hecklers jeered at him.
彼はすぐに半畳を入れる癖がある。
He has a habit of heckling right away.