a term coined in the tv show New Girl which means a person who is in a state of sadness or depression and due to this, goes back to their ex.
Ashley: OMG, did she just get back with her douchebag ex-boyfriend?
Rachel: Yeah but only 'cause she's been super depressed lately.
Ashley: So she backslid to her ex?! What a backslider!
Small nuggets of poop that are about the size of a small grape, and that usually come out one at a time. Named so due to their round shape and small size.
To go back to talking to, dating, or having sex with a previous ex. The backslider tends to be the person who broke it off, but not always. Friends must watch out for their friends who may be backsliding especially with those who have had a recent break up and/or if they don't think the two people should be together.
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.