Bubble hash is a cannabis concentrate comprising countless trichomes, or resinous glands, that have been separated from the plant using ice water, agitation, and a sieve. Bubble hash gets its name from the way that it bubbles when exposed to flame.
Bubble hash came onto the cannabis scene in the mid-1990s and hit the height of its popularity in the early 2000s. The phrase, “If it doesn't bubble, it's not worth the trouble,” became popular during this time for its stark truth. The highest rated bubble hash does just that, bubble all the way to a liquidy, vaporous state.