u/antiyou89

I was in Kobe, just finished having dinner with my wife. We walked past an establishment where 2 young girls (maybe in their 20s?) were standing out front, likely to get people into the bar they work working (my assumption). When I walked past, we made eye contact for short time. After breaking eye contact and walking a little further, one said “munch munch”, then the second one said the same thing. My wife and I tried googling this and can’t really find anything that fits the context. Does anyone know what this means?