Nah, that's just the insult you call him when he hits on you. Something like "if I wanted to sleep with a half ton rutting animal I'd find a deep rothe". Paraphrased of course.
In Japanese Sign Language, this same gesture (with all fingers curled inward except the middle one) means the following: elder brother (hand moving up), younger brother (hand moving down), and siblings in general (one hand moving up, one moving down).
Meanwhile I'm over here like: