(Internet) Initialism of good to go. / (Internet slang) Initialism of got to go (as a form of farewell).

(Internet) Abbreviation of get-together.

(Internet slang) Gate to heaven. / (Internet slang) Great to hear. / (Internet slang) Glad to help. / (Internet slang) Go to hell.

(Internet slang) Get the fuck out; can be used to express disbelief or displeasure. / (Internet slang) Get the fuck off. See get off

(Internet) Initialism of generic top-level domain.

(biochemistry) a protein which binds GTP and catalyzes its conversion to GDP

plural of GTP-binding protein

(biochemistry) Acronym of guanosine triphosphate. / (motorsports) Initialism of Grand Touring Prototype.

(space science) Abbreviation of geostationary transfer orbit. / From Italian Abbreviation of Gran Turismo Omologato. "Grand Tourer, Homologated", used in some sports car names (see granturismo).

(economics) Global Trade Item Number