Characters
Hi, Egon. How's school? I bet those science chicks really dig that large cranium of yours, huh?
— Peter Venkman · Ghostbusters II

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker teases Egon with a greeting and a question about school, then speculates that women in the sciences must find that oversized head irresistible. The joke reads as playful mockery, pairing brainy intellect with an exaggerated physical oddity while pretending it makes Egon a heartthrob.
Context reviewed