First base: making out (french kissing)
Second base: feeling up under or over clothes
Third base: hand jobs and fingering
(3.5: oral sex)
Home run: sex, (including anal)
BOB: We got to 3.5 last night

Bill: 3.5, there is no base called 3.5, are you retarded

BOB: you're just mad cause you're never gonna get there
by Mickey D. May 14, 2008
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Despite what most people believe, "Base" doesn't refer to any form of Speed or Meth. Base refers to Crack Cocaine, which is the FreeBASE form of Cocaine, hence the name, "Base".
"But as the world turns I learned life is hell
Living in the world no different from a cell
Everyday I escape from Jakes givin chase, sellin base
Smokin bones in the staircase"

- Wu-Tang Clan - "C.R.E.A.M."
by RedSoy December 17, 2010
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A substance made up of about 60% amphetamine.
In contrast to speed, which is made up of about 5% amphetamine.

Often methamphetamine is defined as base: "a purer form of speed".
Methamphetamine is a completely different chemical, with different effects. Base is the same chemical as speed, just in much higher concentrations.
Usually has a different effect to speed, as the higher dosage doesn't just mean fuller effects, but whole new ones as well.

NB: both amphetamine and methamphetamine have absolutely NOTHING to do with 2,3 methylenedioxymethamphetamine (ecstasy), despite the uneducated and ill-informed ramblings of the DEA.
personone: Meth is just a purer form of speed.
persontwo: No, that's base you idiot. Meth is a different chemical to speed.
personone: Allow me to kiss your educated feet, master. I revere in your mighty intelligence.
by kako October 15, 2005
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A pure and potent form of amphetamine, comes in a crystaline lump rather than a powder (although is normally cut before use).
Mmmm, that base is nice and soft, cut me a line.
by flame August 29, 2003
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kid - "Damn! Did you see that kid do a 1080 on a skateboard?"
kid 2 - "YEAH! That was fucking base!"
by eml97 May 19, 2011
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