1. tranq - Noun
2. tranq - Verb
(slang) Clipping of tranquilizer.
(slang) The veterinary analgesic drug xylazine, used as a street drug
(slang, transitive) Clipping of tranquilize.
(slang, intransitive) To use the drug called tranq. (Can we add an example for this sense?)
Source: en.wiktionary.org