| 1. | very informal usage in vocabulary and idiom that is characteristically more metaphorical, playful, elliptical, vivid, and ephemeral than ordinary language, as Hit the road. |
| 2. | (in English and some other languages) speech and writing characterized by the use of vulgar and socially taboo vocabulary and idiomatic expressions. |
| 3. | the jargon of a particular class, profession, etc. |
| 4. | the special vocabulary of thieves, vagabonds, etc.; argot. |
| 5. | to use slang or abusive language. |
| 6. | to assail with abusive language. |

Expressions that do not belong to standard written English. For example, “flipping out” is slang for “losing one's mind” or “losing one's temper.” Slang expressions are usually inappropriate in formal speech or writing. (See jargon.)
slang
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SLANG
1. R.A. Sibley. CACM 4(1):75-84 (Jan 1961).
2. Set LANGuage. Jastrzebowski, ca 1990. C extension with set-theoretic data types and garbage collection. "The SLANG Programming Language Reference Manual, Version 3.3", W. Jastrzebowski
3. Structured LANGuage. Michael Kessler, IBM. A language based on structured programming macros for IBM 370 assembly language. "Project RMAG: SLANG (Structured Language) Compiler", R.A. Magnuson, NIH-DCRT-DMB-SSS-UG105, NIH, DHEW, Bethesda, MD 20205 (1980).
4. "SLANG: A Problem Solving Language for Continuous-Model Simulation and Optimisation", J.M. Thames, Proc 24th ACM Natl Conf 1969.