Mendajes is not a spanish word, though 'mendaz' = 'mendacious, untruthful'
But the rest of it means
"Another girl of whom your"
I suspect it might mean: 'Another of your mendacious/lying girls' or 'Another girl you lie about'
"Otra chica" means another girl.
Another / Other
No other girl is as beautiful as your baby.
otra means "other" but the other word is not Spanish.
otra vez / de nuevo
That means "another one goes" - in this case, "another one" ("otra" in Spanish) is feminine.
Ah, the beach again !
Otras is the feminine version of otros, which means other.
es curioso que dijiste que me amabas, y ahora le está pidiendo salir a otra chica
Otra.
otra vez
Otra vez is Spanish for againIt literally means '[an]other time,' but it is almost always translated 'again.'