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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
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2
Opposite of peak. Good luck or fortune. When something goes down that is good on your behalf, base for you. When something goes down that is good for someone else, base for them.
"Gerald scored a fit bird, base for him."

"Just found a tenner, base for me"
via giphy
by Samalam24 May 28, 2017
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3
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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4
1st Base: Kissing and above the waist touching
2nd Base: Touching below the waist (inc digital)
3rd Base: Mouth below the waist
4th Base: Going all the way
5th Base: Going all the way (Gays and fun heterosexuals)
6th Base: Going all the way in Kitkat Club
Person A: It's been four hours since I last got ramrailed!
Person B: What?! You went to 5th base an hour ago!
A: Oh yeah. But only 6th base really counts.
B: Let's go all the way tonight, no regrets, just love.
A: Bring your tops and your bottoms, and I don't mean your bikinis.
All: Gorgeous.
by TrademarkKittySound August 27, 2018
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5
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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7
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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