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1.
GICHAGT stands for: Girl in car having a great time.

Created by Grace Helbig aka Daily Grace.

It's a satirical joke depicting someone who isn't having a great time sitting in the car.

It's usually hash-tagged as #gichagt on Instagram.

Also can be used by guys, perhaps as 'Guy in car having a great time.'
*picture on Instagram of someone looking unimpressed*
CAPTION: #gichagt
by mandacross March 30, 2013