Definition

Playground acronym for 'Already Been Chewed' gum, used by elementary schoolers to decline their classmate's generous offer of pre-masticated mint. A crucial part of childhood vocabulary that taught us all about boundaries and hygiene.

Example Usage

When Tommy tried to share his gum, I had to remind him I don't accept ABC gum—some rules are sacred.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=ABC&defid=12592)