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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When something is done that is macho, undaunted, deliciously retro, heavy metal, punk, redneck, or just plain bad ass, that's so mo!
I just saw a dude walk into a bar with a beer bottle hiding in his sleeve! That's so Mo!
by pokerclack November 26, 2010
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