RG-syndrome

It stands for Ruru-Genshin syndrome. Someone's computer/laptop/mobile is said to have RG-syndrome when their device lags/crashes excessively due to low RAM/ crappy graphic card/ shitty wifi- usually happens while playing Genshin Impact but might occur during other times too.

Person 1: Man, my laptop's been laggin like shit. Ion know what's happening.
Person 2: LMFAOO L bozo. You've got RG-syndrome duh.