In Cannabis culture slang a roach is a term for the remainder of a joint or blunt after most has been smoked. Sometimes in the UK, Ireland and other European countries the term roach refers to the cardboard mouthpiece that is used at the end of the joint.
The word "roach" entered American English from a Mexican Spanish slang word for marijuana, or a cigarette stub of marijuana, or tobacco adulterated with marijuana: cucaracha ("cockroach"; see also the folk song La Cucaracha.) In Spanish, tabaco de cucaracha refers to adulterated tobacco generally.[1][2]
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