rhyming slang slang that replaces words with rhyming words or expressions and then typically omits the rhyming component; "Cockney rhyming slang"
slang -
informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar; "their speech was full of slang expressions"
Slang is the use of informal words and expressions that are not considered standard in the speaker's dialect or language. Slang is often to be found in areas of the lexicon that refer to things considered taboo. It is also used to identify with one's peers.
OmegaWiki Dictionary
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slang Language that is higly informal, considered below what is considered standard educated speech, and consisting of new words, old words used with new meanings, or words considered taboo by people of a higher social status.
slang Terminology which is especially defined in relationship to a specific activity, profession, group, or event.