A sexual partner you have no regard for other then a reciptical for your sperm.
"I just broke up with my 'cumbucket'"
a person who is such a slut that they can be metaphorically represented as follows: as being a bucket which collects the ejaculate of thousands of soldiers who have not seen their wives/girlfriends for years. If every soldier (amongst thousands) was ordered to ejaculate into a bucket, this bucket would represent that slut.
Holy Shit...that bitch is quite the cumbucket
A bucket full of cum.
Pretty self explanatory, I don't know why you googled it.
"Shut the fuck up you cumbucket"
a woman who is with another person as long as that person pays the bills.
..if you had no money do you really think that cumbucket would be with you?
a gallon sized bucket for your cum
dude susan drank the whole cumbucket last night