To be called a social maggot is often derogatory,an in one who is a criminal sociopath,for example.
So, there you have it. A social maggot is,quite simply, a maggot of society. Low-down,dirty,rotten,and inclined to partake of the seedy side of life, though some take this term as a thing of pride. It can also represent a rogue bastard type of individual,one who is self-reliant and liberated.
" Yeah, she deserves better."
"That Chris gal is SUCH a social maggot! She dosn't celebrate any of the traditional national holidays, dosn't watch TV or give a crap about celebrity culture, and is always immersed in some wierdo hobby or other."
" Damn! Can I have her number?!"