(vb.) to get onto one of the bases with someone, like first base = making out, second = feeling up, third = oral
I got to first base with that chick yesterday, but maybe I'll base here again today
by townie R V T June 25, 2006
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 13, 2008
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
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
Something which all is belong to Cats. The bomb has been set up, and they must take off every zig for great justice because they know what they doing.
How are you gentlemen?
by He who likes Bukkake March 14, 2005
crack(freebase)
no i aint runnin base for estaban!
by $pazz April 06, 2003
freebase, rock cocaine...
Yo lets lets go smoke some base....
by Greico July 27, 2003
Morally low, shallow and low-brow
Eli: A club night added me on Facebook, that means I now have 352 friends! Fly like a G6 boys!! Do you guys wanna watch Skins later? They smoke weed in this one.

Jeremy: You are base
by MrRizlaSmoker September 07, 2011

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