Slart Share definition Flag A slimy or "slippery" fart. Often one of those symptoms associated with your common hangover or gassy and/or upset stomach. "OH...ummm... I uhh.. I SLARTed and I gotta go!!!... and sorry about your couch dude..." Slart by YouKnowWho2 March 10, 2008 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