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Obviously means : Talk To You When You Wake Up

Commonly used at the end of a Skype conversation, specially when there is a 12h time difference (between Paris and Hawaii for example).
M: Alright i'm going to bed.
N: Kewl, will you be online tomorrow ?
M: Yes !
N: Alright, ttywywu then !
by Youhouuu August 05, 2010
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