søg på et hvilket som helst ord, for eksempel dog in the bathtub:
 
1.
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!
af Sid! 15. november 2005