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gum that has already been chewed (especially if placed under a desk or chair)
If you chew that abc gum you could get someone's germs.
Gum that has already been chewed,by someone other then yourself. (already been chewed)
matt: Yo man you want some gum?

brian: Naww man thats abc gum
abc gum by g-bus May 9, 2010
ABC Gum is chewing gum that has 'A'lready 'B'een 'C'hewed. Hence the name, ABC .
Random guy: Hey, do you have any gum?
Another Random guy: Ya here's some!
The first Random guy: No thanks! That's ABC gum! Yuck!!!
Already been chewed gum

Gum that has been exchanged or stolen in the process of making out/kissing
Girl - *snap snap snap*
Boy - Hey you stole my abc gum. How dare you!
*Boy kisses girl and takes back his abc gum, thus making it double ABC gum*
He finds ABC gum under his desk at school
ABC gum by eagle365 February 24, 2018
Really bad Already Been Chewed gum. (Hence the name abc👌)
Oh dude I went to the arcade just to find some fucking abc gum under the hockey table! Man that gum tasted bad never die Already Been Chewed gum
abc gum by Yourmomsathot March 30, 2018