It's supposed to be "mankasu". It's the mangaka's nickname. It's a shortening of "mangaka no yanikasu" (cigarette addicted manga artist). "Mankasu" is, uh, also slang for vagina smegma.
It's supposed to be "mankasu". It's the mangaka's nickname. It's a shortening of "mangaka no yanikasu" (cigarette addicted manga artist). "Mankasu" is, uh, also slang for vagina smegma.