means Covered in or resembling slime — wet, slippery, and unpleasantly soft to the touch; figuratively, repulsively dishonest or fawning.

from From Old English 'slīm,' the word for soft mud or ooze, paired with the adjective ending '-y' (so literally 'slime-like'). 'Slīm' has cousins across the Germanic family — German 'Schleim' (slime, mucus) and Dutch 'slijm' — and these likely trace back to an ancient root meaning 'slimy' or 'smear,' the same family that gave us 'lime' (the sticky mineral) and possibly the Greek 'limnē,' a pool or marsh. The figurative sense — a slimy person, all oily charm — is much later, the natural slide from 'feels disgusting to touch' to 'feels disgusting to deal with.'