The first step in a sexual realtionship involving making out or french kissing
"I don't when when that chick is going to give me some action, it's been a month and we're still only on first base!"
by Little Blue Patakha January 16, 2003
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In relationship/sexual terminology, this is the Stage in dating where the couple kisses, or makes out.
It is the First Stage, starting with the first kiss, and leads to repetition to say Goodbye or Goodnight.
It signify's the Beginning of being in love.

This can lead to French Kissing, or kissing of the Tongue.

This is the Beginning of Courtship, or a Physical-Loving Relationship that naturally resolves to advancing sexual stages until 'Home Plate'.
"Jimmy made it to First Base with Kelly today!"
"Congrats to him - Maybe he can find that Gum I left in her mouth last week..."
by SMX February 8, 2013
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French kissing. Is followed by feeling up second base, oral third base and sex home run
I finally got to first base with matt last night!
by alesandra December 29, 2005
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The verb form of first base (which means French kissing or making out), "first basing" someone is kissing them passionately or making out with them. Used to great effect by Strong Sad of Homestar Runner fame when speaking to his brother Strong Bad, spied kissing a piece of paper.
Uh, Strong Bad, were you just first basing it with that piece of loose leaf?

I went to go ask my brother a question and caught him totally first basing his study buddy.

I was so drunk last week that I ended up first basing my friend's girl.
by Talmanes May 15, 2007
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The French Kiss. Not just a peck on the cheek or lips. You gotta use your tongue.
"How far'd you get with her?" "Only first base, I might lose her if we don't get any farther"
by footballstud580 April 3, 2004
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