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Acronym: Thread With Extraordinary Survival Instinct Syndrome.

Typically applies to threads in bulletin-boards/forums that are active over an unusually long period of time.
Example: This Happy Birthday thread is just another to be affected by TWESIS! Few birthday threads last this long!
by Sid! November 15, 2005
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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