It’s fake flexin' on the internet, first introduced in Calgary, Alberta, Canada on an unreleased song by YRWBaby a young artist from the area. The term came up because it fit with some rhymes in the song and popped up in YRWBaby’s head... it then became small slang for some Calagrians.

lil mad is like big mad but the opposite, you mad but not mad to the extent of pullin somthin