look up any word, like swoll:
 
1.
In address to scrotum grip positions, "the bubblegum" is defined as a cockringed, underhanded grasp of the nuts and sack, however with balls nestled comfortably in the palm of the hand and thus out of sight. The excess scrotum skin overflowing from the round opening between the thumb and index finger in the "ok" or "agreement" hand signal make "the bubblegum".

The excess skin takes the semblance of a chewed piece of bubblegum. Often cited as a derivative of "the brain" and a distant relative to "the batwing"
"My homie snapchatted me a pic of his ass, so I rebutted with "the bubblegum"
by extrablend October 22, 2013