noun
(computing, slang) Perceptible pause in the smooth rendering of a software application's user interface due to slow operations or poor interface design.
(video games, slang) Game mechanics of unconventional or flawed design or implementation, and the experience of such mechanics, as to ruin or disrupt play, or break immersion; e.g. bugs and glitches.
(by extension) A game, or games, with such mechanics.
adjective
(computing, slang) Janky.