Short for Cock Sucker Mother Fucker. Or (as one Co So Mo Fo thought) Cock Sucking Mother Fucker. Either way its somone who sucks cocks cock sucker and fucks mothers motherfucker
for example "That Adie is a gaylord what do you think?", "Yeah he's a real Co So Mo Fo!!!"
by UK_Greg November 19, 2006
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