Drop a bundle on (someone or something) phrase
To spend a large amount of money on someone or something
Parents drop a bundle on children's education in the hope of seeing their children successful.
Girls often drop a bundle on clothes and cosmetics.
The verb "drop" must be conjugated according to its tense.
The origin of this phrase is not clear.
A group of bad or sinful people
You'd better stay away from them. They are a nest of vipers.