The generally used bases, as I've heard them in my region (SW PA):

1st Base - Frenching
2nd Base - Feeling and/or Hand Jobs and/or Fingering
3rd Base - Oral and/or Anal sex
Home run - Sex

Another version I've heard is the four Fs described in another definition, and also a kind of silly one that had sex at third, 2nd at anything other than sex, 1st at kissing, and home run as getting married.
Last night when my boyfriend was "up" to bat, we rounded _all_ the bases.
by JZ June 16, 2004
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The opposite of 'woke'
Dave is so based. Unlike Aaron, he doesn't form his opinions around what is considered most politically correct by others or according to how many perceived victims he appears to care about.
by Reckit January 14, 2021
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a form of parachute jumping. the term comes from the words building antenna span earth, the four favorite sites for jumping.
"We went base-jumping last week, man, that was the craziest thing I've ever done!"
by Johannes March 27, 2005
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1st: french kissing
2nd: fingering/ handjob
3rd: eating out/blowjob (oral sex)
4th/home run: sex
Bases: Dude, i went to 3rd with kate at that party
by chrisyxoxo August 25, 2008
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1. In war, places where weapons/supplies are held. Also provide protection from enemy attacks.

2. Chemistry - Any substance with a pH greater than 7. Also considered any substance that can act as a proton receiver.

3. Objects in baseball that batters run to when they hit the ball.
1. America just invaded another Iraqi base.
2. KOh (Potassium Hydroxide) is a strong base.
3. Alex Rodriguez hit a home run but forgot to touch 3rd base.
by The truth May 11, 2004
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"Dude, that was so base."
by HEYTHEREHEY March 19, 2008
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To have an opinion which is exceptionally well bounded in reality.

Can be used as an expression of strong agreement or admiration, or otherwise strongly positive reaction to something.
Person 1: "Look at these people protesting this statue. This person accomplished more during their life than the entire effort of all the protesters combined. They may have lived during a time where socially acceptable norms were different, however the statue is a piece of our history - we own as a society as a posession as much as it is a piece of art and a centerpiece for academic study for how our society has changed and what we might learn as we develop towarsds the future"

Person 2: "Based"
by Rehabilitated Bloke June 24, 2020
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