slimy

Short definition from Wiktionary

Adjective

1. 1
   Of or pertaining to slime
2. 2
   Resembling, of the nature of, covered or daubed with, or abounding in slime
3. 3
   Friendly in a false, calculating way; underhanded; two-faced; sneaky; slick; smarmy.

Noun

1. 1
   A ponyfish.