Hashy means: An adjective with two distinct senses: first, in drug slang, it describes something that resembles marijuana in smell, taste, or quality - typically used to describe food, smoke, or a vague herbal. The word is mostly archaic or historical; you will only encounter it in old texts, period drama, or school history rather than current teen conversation. It has drug-related associations; worth a calm conversation about which side of the topic your teen is on. This is a food-related word and harmless in itself.