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
1 more definition
Top Definition
An acronym for the words giggle silently to myself
David:
Damn it, I stubbed my toe!

Alisen:
G.S.T.M., that sucks
by MR_AWESOME607 February 22, 2010

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