noun Perceptible pause in the smooth rendering of a software application's user interface due to slow operations or poor interface design.
noun 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.
noun A game, or games, with such mechanics.
adjective Janky.
Sadly, my new laptop is even more jank than my old one.