Ew（ちんかす）

He Says:
chin-kasu　（ちんかす）=sperm dreg
This is applied way of kasu.
So it's good to use this to men, who seems to be young.

She Says:
"Chin" means "dick" and "kasu" means scum. So looks like we've got "dick scum" or maybe we should say "dick crust". That seems more accurate. Generally used to insult younger men (e.g. 20s or younger).

The next word will be...げす。