When a group of friends/family are able to consistently share goods times, such as drinking whiskey and/or smoking a pipe, and are able to always, even when i doubt, get along. That my friend is what you call a cunbundle.
So say you are invited to small party by your friend. You go. When you get there is is obvious that everyone knows each other. As the night gets late you realize that you more of a fifth wheel so you make the comment "boy you guys are quite the cunbundle are'nt you?"