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1.
To dispense ejaculate into a public swimming pool, for the purpose of attracting sluts.
David Randle was chumming in the kiddie pool, so he was arrested.
by Cockman442719 February 27, 2011
 
2.
discarding waste to attract fish
A person sometime will cut up fish in a bucket to attract other fish to the area... Man what are you doing, "I'm chummin."
by Trever Powers November 11, 2003
 
3.
someone that eats out of control
he is chummin on that chicken.
by reidizzle July 20, 2003
 
4.
When that special girl is extra bitchy during her time of the month.
Don't worry man, she's just chummin right now. Let's just hope it doesn't attract bears. Yeah, bears.
by drstrangeface September 06, 2013
 
5.
Mackin' on a chick.

When a chick is diggin you.
I was @ the bar and this chick was totally chummin on me.
by seanpatricklear November 03, 2011
 
6.
***UPDATED***
1.The attempt to push yourself after obvious signs of exhaustion, which is triggered from any form of exercise. Most common in white females.

2.The slow-paced form of exercise that only looks like it is actually doing something, but in reality is no more effective than walking. Most common in white females.
1. On the last turn of the 400m, she was chummin'.

2. She was chummin' on the treadmill at the gym, it was so weak.
by Qurman778 December 21, 2010
 
7.
The attempt to push yourself after obvious signs of exhaustion, which is triggered from any form of exercise; Most common in white females, but anybody can chum after a while.
She was chummin' halfway through our run today.
by Qurman777 December 02, 2010