boink Share definition Flag A word that your parent's use to describe sex to you, even when you are an adult. Oh my lord, Jennifer! You're... you're not BOINKING him, are you? Yes mom, he's my husband. boink by JenThe80'sFan October 18, 2003 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