slabber Share definition Flag someone who talks alot of annoying shit..typically a northern irish slang word. shut your trap you fucking slabber before i knock yer ballix in!! slabber by stuart March 16, 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