Gaşyet is the absence of the qalb (the heart) due to what comes upon it, and the manifestation of this state (unlike ghayba [spiritual absence]) is apparent in the outward aspect of the servant. (Luma, 416)
Gaşyet, in contrast to sukr (spiritual intoxication), is mixed with human nature; thus, at the moment of its occurrence, there are changes in one's nature and sensations. Such a condition is of a kind that may invalidate ablution. Gaşyet does not persist, whereas sukr is continuous. (Luma, 417)
(See also: ghayba-ḥuḍūr; sukr-saḥw)