pith Share definition Flag 1. White stuff in citrus fruits. 2. piss pronounced with a lisp I've got pith all over me. Don't pith on the grath! Are you taking a pith? I'll pith on your faith! pith by W. Churchill March 28, 2007 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