abbreviation in organic chemistry for the
t-butyldimethylsilyl protective group (commonly used to protect alcohols, rendering them unreactive to a variety of reaction conditions).
A TBDMS group can be removed to reveal the alcohol either under acidic conditions or by employing fluoride ion.
it stands for "talking to myself" , when that person you're talking to on-line doesn't talk, so you say ttms, so that they realise they've ditched you.
Roro: i think star wars was really good! have you seen it?
Vicky: ...
Roro: ttms ¬¬