Shortened form of "City Slicker." Anyone from a non-rural area, that enters a rural area. Usually not very knowledgeable, concerning rural customs. And not very outdoorsy. Also see "City boy" "Townie" or "Greenhorn"
Some damn slicker came into the bar lastnight, with his yuppie girlfriend. He looked about as pretty as she did.
A smart and deceptive man who tricks women into having sex with him by pretending to be someone else but while he bangs the chick he secretly records her so that she can't retaliate if she finds out the truth about him.
Anna: Hey Mia! How are you?
Mia: Not good ! Drew broke up with me!
Anna: Really ? that banker you were going out with?
Mia: No he works as a bloody salesman. He lied to me and used me for sex. He's a fucking slicker
Anna Oh my god. Did you file a complaint?
Mia: No he's got my nudes and told me to stay away from him and he's threatening me that if I tell anyone he'll circulate the pics
Anna : oh shit that fucking slicker
A 'slicker' would be the person licking and tonguing your asshole while you are fucking someone else. Usually your girlfriends dog or perhaps a neighbor or cab driver.