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Backside Attack

1) The SN2 mechanism in which the nucleophile attacks the alpha carbon from a direction directly opposite to the C-LG bond. Results in inversion of stereochemical configuration.

2) When attacking a loved one from the back side
1) Wow that strong nucleophile caused one hell of a backside attack.

2) John: dude i went for the back side attack last night
Joe: Howd it go
John: Lets not go there.....
by morty foster July 20, 2008
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backside cutie

A girl who you assume has a pretty face by how her posterior(backside) looked but end up losing interest when you sees her face/front.
"I saw a backside cutie today with one tits and a troll face! Wut's wrong with me!"
by Stephen Yuan June 1, 2007
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no backsies

Originating in the game of tag, no backsies is a maneuver in which a player that is "it" cannot be tagged back immediately following the tagging of another player.

No backsies can further be extended into the real world, where people use "no backsies" as a means to avoid doing a task.

To invoke the rule, one must simply say "no backsies" before the item or action in question is returned to its original source.
Example 1: Alice, Bob, and Corey are playing tag, and Alice is "it." Alice proceeds to tag Bob, making him "it." Bob turns around and tags Alice right back. Alice neglected to say "no backsies," and is now "it" again. Bob would not make the same mistake. As his hand touches Alice's shoulder, he screams "no backsies." He then proceeds to punch her in the face for good measure. Bob cannot be tagged "it" until Corey has been tagged. Which won't happen. Alice is in the hospital.

Example 2: Alex and Daniel are arguing over whom has to put away all the toys back into the chest. Their mother comes in to threaten them that if a certain thing isn't put away within the next minute, they would both get in trouble. Obeying the unwritten rule that the last one to touch something must put it away, both proceed to argue over who actually touched it last. Daniel picks it up and throws it at Alex, hitting him in the face, and calls out "no backsies." Alex, now bruised from the padlock that their mother wanted put away, now has no option but to return the heavy metal object back to the toy chest.
by David Fier March 9, 2006
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Backside Ron

Taking advantage of any situation in which you are either taken by surprise or you take someone by surprise.
I had a backside ron done on me when my wallet was stolen without me noticing.

When you are doing someone doggy style and you stick it in a bad place un announced.
by Johnson Streaker July 21, 2009
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backslide

verb: To revert to sin or wrongdoing, especially in religious practice.
Even after tasting true freedom in Christ, Alex found it easy to backslide into habitual ways of the flesh.
by Mads Entry July 14, 2006
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backsideous

Resembling arse to the latter. This word was born by me spending too much time working for a large corporate company where buzzwords nobody dared to question the meaning of (for fear of looking stupid) were in great abundance.
"That was a backsideous statement" - i.e. "You talk crap".

"Backsideously entertaining" - Not in the slightest bit interesting.
by Paul September 10, 2004
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backslide

When one goes back to their Exs.
'I can't believe you're with her again.. Man, you're such a backslider, you always backslide!'
by New Girl123 October 12, 2012
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