Chavalitas is the affectionate, diminutive form of chavala, a colloquial word for a 'young woman' or 'girl'. While common in Spain, it's used in some parts of Mexico and in this song to mean something like 'gals' or 'chicks'.
As the song's title, this word is your key to unlocking its meaning. The singer lists all the different chavalitas in his life, giving you a window into the slang and culture of Regional Mexican music.
Fuerza Regida gives us a look into a wild and chaotic lifestyle in "CHAVALITAS." The singer describes a life filled with parties, money, and a constant rotation of women. He's looking for specific types: "una chavala que me diga 'Papi'" [a girl who calls me 'Papi'] and "una gabacha que me diga 'Fuck me'" [a foreign girl who says 'Fuck me']. The song repeats the line "Y otra vez en la pinche loquera" [And again in the fucking craziness], making it clear this is a cycle he's living over and over.
He has a very cynical view of his relationships, using blunt and offensive language to describe the women he's with. He complains about his luck but also seems to enjoy the chaos. He spends huge amounts of money, giving one woman a Cartier watch and then a house, telling her, "No digas nada, quédate callada" [Don't say anything, stay quiet]. There's a sense that everything is temporary and women are replaceable, as he sings, "Y una más bonita y la otra pa'l olvido" [And a prettier one and the other to be forgotten]. It's a boastful track about living fast and spending freely.