A small or minor critic; a term of mild contempt for a petty critic.
From critic plus -kin, a diminutive suffix (from Middle Dutch kinne, meaning 'child'). Unlike -aster which is contemptuous, -kin is usually more affectionate or playful.
The -kin suffix gave English the word 'pumpkin' (from Dutch pompoen-kin, 'little pumpkin'), so when you say 'critickin,' you're ironically calling someone a 'little critic' the same way we say 'lambkin' for a small lamb.
Complete word intelligence in one call. Free tier — 50 lookups/day.