When someone cums in their piece of bubblegum.
Hoob: Bro! I just made a Cum OF Gum! It looks so cool!
Goog: I want a bite!
The act of giving a blowjob with gum in ones mouth then preceding such blowjob the gum absorbs the semen from said blowjob.
After I gave frank a blowjob I had a huge wad of cum-gum
Bad gum that you chew and it turns watery in your mouth.
Man I bought this new pack of chewing gum and 3 seconds after chewing it it turned into cum gum. Ya know, all watery.