The act of witnessing something so traumatic or disturbing that it is futilely wished to be unseen. Most commonly experienced on 4chan's /b/ or senior citizen dating websites.
See also: eye bleach
Me: Oh hey, look, some Nigerian dude emailed me a file called BlueGoatseWaffles! Maybe its a picture of blue goats doing people stuff...like cooking waffles!
*Click*
*35 seconds later*
Me: What has been seen cannot be unseen.
Cigarette: Northern slang for a cigarette, used oft by mashed up mancunian ravers becasue of the resemblance of a hot(electric)stove to the end of a lit cigarette. Originated circa 1991 in the early halcyon days of the rave culture; we speculate during a drug fuelled hallucination by said manc.
'fuck me noel, i am bolloxed, is that a ciggy in your mouth, or the stove from me 'nans kitchen'/
General use: 'Give us a stove you cunt'