Would you please tell me what does the phrase "rave over" mean in this context?

Bright boys rave over young girls.
To rave over X is to bestow exaggerated praise on X.

The praise would not necessarily be delivered directly to the "objects of praise."
The "bright boys" might simply be "raving" amongst themselves over/about the charms of the "young girls" in question.

In the same manner, they could "rave over" the features of a new automobile design.
Site Hint: Check out our list of pronunciation videos.
They are very excited and/or talking enthusiastically (almost like a madness) about girls.
Thank you, Avangi, Lakswadeep.