• To [inject] a drug, usually [heroin], into a [vein]. Also used to refer to the drug itself.


    Mainline meaning & definition 1 of Mainline.


  • To watch a large amount of a geeky television show, episode after episode, for a long period of time. A season of [Buffy] in two days, for example.
    Similar to [marathoning] movies or [chain smoking], but more geeky.

    Mainline meaning & definition 2 of Mainline.


  • A [persons] main [significant other], even though they may be dating several people [at once].

    Mainline meaning & definition 3 of Mainline.


  • A chief railway line.

    Mainline meaning & definition 4 of Mainline.


  • involving beliefs, methods, etc. that are most common:

    Mainline meaning & definition 5 of Mainline.

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This page shows you usage and meanings of Mainline around the world.