A phallic saint is a type of saint who is associated with male genitalia, or the "private parts." Sometimes these saints are depicted with statues or images that show a penis, or with stories that involve sexual themes.
This may sound strange or inappropriate, but in many cultures throughout history, sexuality and spirituality were considered closely linked. In ancient Greece, for example, the god Priapus was worshipped for his ability to bring fertility and abundance - and he was often depicted with an enormous, erect penis.
In some Christian traditions, certain saints are believed to have powers related to fertility, sexual health, or sexual purity. For example, in the Mexican Day of the Dead celebration, a figurine of San Pasqual (St. Paschal Baylon) might be included with offerings to ensure a bountiful harvest or successful sexual encounters.
It's important to remember that different people have different beliefs and customs, and what might seem strange or uncomfortable to one person can be perfectly normal or even sacred to another. Ultimately, whether or not to venerate phallic saints is a personal and cultural choice.