If you were to look at the digestion organs inside a bumblebee, they are a lot like your own. They do about the same thing. A bumblebee has a throat (esophagus) that goes from its mouth to its stomach. It has a midgut that is a lot like your small intestines. And it has a colon that is a storage place for poop a lot like your large intestine is. A bumblebee also has a rectum. When a bumblebee needs to poop, it opens its rectum and muscles push the poop out of the colon.
I've kept honeybees before. Honeybee poop is liquid and yellow, and honeybees almost always do their pooping while they are flying outside the hive.