What does TTSIA mean?
The Title Says It All
Other definitions of TTSIA:
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How to use the term TTSIA:
There are no example uses of TTSIA at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

GTRM
Going To Read Mail

LSHIH
Laughing So Hard It Hurts

FYI
For Your Information

JCATH
Just chilling at the house