It means that sus is sus”sussy mean sus”
"The opposite of being drunk, its as sober as you can ever be. It strips away all the illusion, all the comforting pink fog in which people normally spend their lives, and lets them see and think clearly for the first time ever. Then, after they've screamed a bit, they make sure they never get knurd again" - Terry Pratchett
A lot of people act sussy. so like if someone was walking bakwards shaking their head and and there arms and there torso and saying deez nuts they would be sussy.
Person 1: Deez nuts, ur mom, oofoos noblunt!
Person 2: Dood stop acting so sussy!