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1.
Similar to a dingleberry, I'ts the undeveloped turds accessible when digging in your pants even while sitting down
Ben: Dude, check out that guy over there sniffing his own BumGum
by Ricktionary March 09, 2011
 
2.
When one's body doesn't digest gum and they poop it out.
Man, what are you chewing on, it smells like bum gum.
Swallowing all of that Bazooka allowed me to produce my very own bum gum!
When that girl gave me a hot rodney, she proceeded to chew on my bum gum. sick ass.
by Jonny Vessely September 13, 2007