Yal is a Puerto Rican slang to be specific. It’s a women who have no education, no manners, she speaks loud and curses and dresses too provocative and lives in a residential (a ghetto place where low income people with no education live) . Yal is a woman from the streets basically.

yal" is another hispanic slang word mostly used in South America. It is used in spanish song lyrics like reggaetons and means "girl" or "baby". Esa es mi yal. That's my girl(friend). I googled this and found it in the urban dictionary.

I haven't heard it in my life, so I guess is slang, but I don't know on what country they use it