Thai stick is now commonly available in the UK. Thai Stick is basically hight quality thai weed, usually wrapped around a stick and held together with cotton. It is remarkable strong for Thai, but nothing to blow your mind away. It is more luxury than other weed, and gets you stoned, but is not anywhere near as strong as skunk or high quality hash. Quality and strength are of course not the same thing.

Zack C. Sessions writes:

Thai Stick was popular during the late 60s and early 70s, it would be primo buds of usually seedless pot skewered on pot stems and tied on with strings pulled off of the pot stalk and then the whole thing dipped in liquid opium and allowed to dry. It is, as suspected, very potent, like two or three toke stuff. In this area it was popular (and more or less available) until the late 70's.

However,reports of Thai Stick being dipped in opium are apocryphal. I know of no studies that verify that Thai Stick has ever been dipped in opium, and I suspect that these rumors were a result of people not believing that marijuana could be that potent unless something else were added.