Amphetamines that have been made by an amateur at home or in makeshift conditions. The name alludes to "bathtub gin," referring to the use of bathtubs in creating illegal alcohol (most often gin, hence the name) during the prohibition years in the US. Stay away from that bathtub crank, man, it's sure to mess you up!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. homemade amphetamine. (From bathtub gin.) Somehow she got hold of some bathtub crank and had a really bad trip.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.