In the context of Grindr, a popular dating app for LGBTQ+ individuals, “bb” typically stands for “baby.” It is often used as a term of endearment or affection between users. For example, someone might refer to another user as “bb” in messages or profiles to convey a sense of intimacy or playfulness. This shorthand is common in online communication and can help create a more casual or flirtatious tone in conversations.