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slang A bisexual person who is struggling in some area or areas of their life. Typically used as a humorous self-identifier. The term originated from a meme that references a 3x3 Dungeons and Dragons character alignment chart and allows one to identify as "gay," "bi," or "lesbian," and to categorize their ability as "distinguished," "functional," or "disaster." I just feel like everything in my life is falling apart right now. Textbook disaster bi. Oh, my sweet disaster bi. You will find love one day.
1. n. one of the biceps. (Bodybuilding. Typically BI. Usually plural.) I have to work on my BIs and then build up my thighs.
2. mod. bisexual. Suddenly she suspected that she was getting involved in some sort of strange bi activities.
3. n. a bisexual person. This information of interest only to bis and gays.