To tell someone to be quiet or silence. Wow or exclamation of important event or situation
If u are watching a programme and someone starts talking you would say wisht, as in be quiet.

Pretty girl walks down roud and you say wisht to your friend, as in "look at that!"
by Leon Walsh March 17, 2008
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ginge: ure a r8 fat twat
fatboy: hod your wisht you ginger twat
by jus that lad ye November 12, 2007
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