Top definition
Proper: A chemistry term used to describe the transfer of electrons and subsequent bonding of a neucleophile to the back face of a molecule. The back side described is the chiral center, with subsistents in a tetrahedral formation facing away from the nucleophile. Once the backside attack is complete, the stereochemistry of the molecule is inverted.

chem eng slang: A difficult academic situation. It is often used to describe the difficulty of an assignment or a test. Synonymous with ass rape.
"Oh shit, that exam was a total backside attack!"
by Electrick March 16, 2006
Mug icon

Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

Buy the plush
2
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 October 24, 2007
Mug icon

Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

Buy the plush
3
Term used for the attachment of the nucleophile in an SN2 reaction to kick off the leaving group. In slang, it means to fail a test or have a lot of difficulty on a test, especially an organic chemistry test.
That orgo test just back-side attacked me, SN2 style.
by synchrohobbit November 19, 2006
Mug icon

Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

Buy the plush
4
"Yo, last night was mad crazy when you gave me the backside attack."
by CHEMTROLL November 15, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
5
Real-A term used in chemistry to describe a chemical reaction mechanism.

Slang-When a girl who doesn't know you are there bends over and you (attack/ hump the fuck out of) her backside.
Girly was bending over so i busted her up with a backside attack
by The Doug April 11, 2003
Mug icon

Donkey Punch Plush

10" high plush doll.

Buy the plush