What does "liner" mean in slang?

Liner in slang can have several meanings depending on context and community, but common slang uses include one-liner meaning short funny joke delivered in one line, eye liner or lip liner in makeup slang, and in drug culture liner may refer to small line of substance or small amount, or in graffiti slang liner is marker used for outlining. In comedy slang, liner as in one-liner is joke told in single sentence with punchline, as in comedian told great one-liners. In makeup slang, liner refers to eyeliner or lip liner. In British slang, liner may refer to ocean liner or eye liner. In some street slang, liner may refer to small bag. In music festival slang, liner may refer to schedule. However liner is not extremely common as standalone slang, more often appears in compounds like one-liner, eye liner, and coke liner meaning small line. So liner in slang most commonly means one-liner joke, or refers to makeup liner, or small line of substance, with meaning determined by whether comedy, makeup, or drug context, but generally slang liner refers to something that makes line or short line joke.