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1.
The biological moistening (slickening) of one's vagina in preparation for penetrative sex.
Good lord! He got me so aroused that my slicky seeped through my capris!
by Phondookee June 28, 2005
 
2.
A promise, or way of verifying truth, that can not be broken involving a wriggling of ones fingers against anothers.
Braking slicky induces diabetes
"No way did you shag her. Slicky on it"

*Slicky*

"You legend"
by LifeOnAFarm April 29, 2009
 
3.
slippery condition.
After the rain the roads were slicky but we still had gription.
by Debby Tallent August 25, 2008