Gen Z slang for someone who thinks they are smarter than they really are or has an unrealistic mental image of themself to the point they are lying to themself. Usually used in a derogatory way but can also be used in a nice way if the person said something unrealistically negative about themself.
Plus sized torta model: Wow in getting so many likes on instagram im such a baddie all the guys must want me.
Person 2: Thats fab nobody wants to see your rolls hang out.
Example 2
Pretty woman: Im so ugly I feel selfconscious about my face and my body because im so ugly.
Person 2: your being a fab Janet
The rare hairless sland is very fab lurk and lives in the urban dictionary sink hole in juxtaposition to Slandette and Patrikka the winking merging rattled squids that live in vestibuels eating fleek potatoes, doing fifer scissors, while being monitored by Chris Chance amongst the flaming flailing squids falling from hot tub trees.