gah Share definition Flag An interjection denoting frustration and/or excitement. Gah! I scored only 95 on my last science exam. They'll never let me back into the science club again. gah by stupid May 30, 2004 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