I would never want to trivialize mental illness and that wasn’t my intention. “Bipolar” can be used in many contexts, for example a bipolar distribution in statistics. Here is the definition Google gives me…

bi·po·lar

bīˈpōlər/

1. having or relating to two poles or extremities.

“a sharply bipolar division of affluent and underclass”

2. (of psychiatric illness) characterized by both manic and depressive episodes, or manic ones only.

3. (of a nerve cell) having two axons, one either side of the cell body.

4. ELECTRONICS (of a transistor or other device) using both positive and negative charge carriers.