Generally speaking, one is a douchebag before they graduate to douchebucket, but some losers can go straight to bucket level (See: @ChrislHayes)
Leroy: Why da fuck did you do dat?
Smitty: I was watching MSLSD and that little twerp in woman's glasses was yammering and I lost it.
Leroy; That muhfuh is a douchebucket.
2) someone who's being a total jagwad for no real reason.
3) neither a delicious or nutritious treat.
"yup. all of them."
"i don't think that would taste very good."
A bucket of douche. Someone who has so many douche-like qualities that they are beyond the idea of a single douche, but rather they are many douches, capable of becoming more douchey at any time.
He is not just a douche, he has become a douche bucket.
example 2: I bet rosie o' donnell would enjoy a bucket of douche!