When you're totally surrounded by an enemy, and there's no escape, a trusted friend stands with his/her back touching yours, so you both can fight in efforts to protect each other's back. This can be done physically as well as verbally. The unity and dedication of the two coming together in this formation to act as one is a tactical defense whatever the battle may be.
At the Hot Gates (in the Hellespont), there were only two Spartans left against the Immortals who had encircled them. The two stood back-to-back defiantly in complete confidence of each other's capabilities and dared the enemy to attack, thus saving Western Civilization.
by Kit Carson January 16, 2010
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It's when you have sex with 2 separate people without a shower in between.
"Bro, how did your date go?" "So well, we hooked up and then I went over to Sasha's afterwards". "Bro, that's crazy". "You're telling me, I didn't even get time to shower in between, ran it back to back".
by Dreamboys August 6, 2020
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A poop without a partner is a sad road to face after a night of a hard drinking, and the woods are a cold and lonely place.

Share the struggle and share the joy. Lean with solidarity against the back of another while you face the night together.
"Let us Back to back it, friend, as we squat and poop in the woods. The shame and the freedom: tonight, they are ours, together.
by I Have Walked December 30, 2011
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Backs on backs means you have a big bum, basically having a bigger bum then a normal big bum
She has backs on backs on back
by gmg😋 July 2, 2017
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Hmmm. It is a single girl term....that I recently just learned. You may want to learn it too. Maybe a word that is popular on Tinder or Grinder. Meaning sex or whatever term you both decide, two days in a row. More than a one night stand. It must be that good or better. It must be great. Or more.
Will you and me, "back to back," just maybe? Please.
by Femalesheep June 14, 2014
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Hitting the blunt or joint twice and then passing it.
"Yo guys hit it back to back then pass it"
by Kevin Crosby May 20, 2005
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When you are in the cross fires of militant factions who are all shooting at you and your partner, and will probably suicide bomb the shit out of you if they get close enough. So then you're like "Back-to-Back!!!" and you and your partner are back-to-back against each other shooting the shit out of them with machine guns.
(scenario: their are about 10 radical militant motherfuckers running at you strapped with explosives from all angles, and you are surrounded)

You: "Holy Shit! We're fucked!"
Your Partner: "We only have one choice."
You look at your partner, and then say " BACK-TO-BACK!!!"

(Guns firing... you kill them)
by AO2 June 19, 2008
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