No one knows for sure, but it involves a telephone, tebasco sauce and the anus
Watch out or you will get fifth based
by Bangdar May 17, 2007
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The true test of a relationship. It is when a male and a female truly love each other--through marriage, pregnancy, children and everlasting happiness. Sure, it may be cool and stuff to go for the milk instead of buying the cow, but you won't be saying that when your temporary slutty partner begins to hate you.
Lifeless dumbass who is too insecure to use a spoon or watch the movie Titanic: Awww man. All that work I did to get to a home run and now I have to start over. I envy all the nice guys and girls actually able to sustain a relationship :(
by VGerX2001 September 5, 2004
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The absolute ultimate feminine honor --- a sign of trust and permissiveness that's actually even greater than her allowing you access "down there" --- namely, a chick's giving you a copy of the key to her house or apartment, so that you can just gleefully waltz right on in and "get it on hot 'n' heavy" with her anytime you desire.
Fifth base is actually kind of a "mixed blessings" spot to reach on da ol' playin'-field... yes, it is indeed a wonderful thing if a nice lady entrusts you with the "magical strip of brass", but like all situations like this, "with great power comes great responsibility"... you'll want to "guard that key with your life" --- securely tether it to a sturdy key-ring and/or chain, keep it hidden or locked up when you're at home, and never let it out of your sight when you're traveling... there are far too many less-than-honorable individuals out there who might wanna access said key for equally-less-than-honorable purposes!
by QuacksO November 21, 2018
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This girl got to Fifth Base and Beyond, with me last night. Never again will i go out alone
by maxlarue63 March 12, 2013
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