It's a texting lingo that means Giggles Silently To Myself
Cellphone A: I just got hit by an old women for asking where the cheese aisle was
Cellphone B: GSTM
by Dragon565333 September 11, 2010
Top Definition
An acronym for the words giggle silently to myself
Damn it, I stubbed my toe!

G.S.T.M., that sucks
by MR_AWESOME607 February 22, 2010
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.