In information technology, hiccup is an informal term for a non-recurring problem of indeterminate cause that usually does not cause a significant disruption of work or activity. A hiccup might be due to a transient power level change, a program bug that is only encountered under very rare circumstances, or something else. Unlike hiccups in human beings, a hiccup in a computer or a network tends not to be followed by additional hiccups. If it does, then it may rise to the level of a "problem."
A hiccup is similar to a glitch in terms of its temporariness, but is usually less serious.