According to the search results, 69 refers to a sex act that involves performing oral sex with a partner simultaneously). It is also known as "69ing" or "doing 69". The name comes from the fact that the participants are mutually inverted like the numerals 6 and 9 in the number 69). The position can involve any combination of sexes).

It is worth noting that the number 69 has other meanings as well. For example, it is an angel number that relates to new beginnings and can also relate to love life and family life. However, in the context of the question, it is clear that the meaning being referred to is the sexual act.