seccy Share definition Flag A slang term for a security guard, which orginated in Western Sydney Man 1:The seccy wouldnt let me in the club Man 2: Yea seccy's are strict on dress codes seccy by ash00 September 24, 2009 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug