A point where an abstract entity, such as an argument, conversation, or situation, branches off or develops a complication.

本来是说工作的事，结果他话里出了个丫巴儿，扯到了私事上。

A physical junction where a structure like a tree branch or a road splits into multiple directions.

在那棵老槐树的丫巴儿上，喜鹊搭了一个窝。