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
idgi - I don't get it
To express the feeling of wanting someone to explain
To explain that the person is not being clear enough
To simply explain that you don't understand
""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!""