IDGI is short for "i don't get it"/"i didn't get it" , can be used when you didn't understand a joke or didn't get something (mostly will be used in texting apps like Messager)
^when someone didn't understand a joke^
Person A: *tells a joke*
Person B: c'mon man, IDGI
^When someone didn't get something^
Person 1: *tells them about the the toy*
Person 2: umm... IDGI
Person A: *tells a joke*
Person B: c'mon man, IDGI
^When someone didn't get something^
Person 1: *tells them about the the toy*
Person 2: umm... IDGI
by UrbanToy February 10, 2021
Get the IDGImug. 
""how come my blankets are sideways. but they become sideways when i flip them, then they become straight when i flip then again?? IDGI!! I JUST DONT GET IT!!! IT MAKES NO SENSE!""
by zentron July 30, 2023
Get the idgimug.