phenomenal Share definition Flag Something absolutely fantastic and one of a kind in greatness. Tends to be used to describe Irn Bru. "That's Coke's aye raj ya wee midden. Geez us an Irn Bru. It's pure phenomenal, like." phenomenal by Limbo Murfbiscuit December 1, 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