Definition of l-carnitine:
(n) :
(Internet slang, by extension) A fail.
(adj) :
(slang) Bad, subpar, of inferior quality (abbreviation of loser). (Compare noun etymology 2, sense 1 and etymology 2, sense 2.)
(n) :
(slang) Two cigarette papers laid perpendicularly on each other when making a joint.
(n) :
Abbreviation of litre or liter.
(n) :
Abbreviation of leaf. [The usually green and flat organ that represents the most prominent feature of most vegetative plants.]
(n) :
Abbreviation of loss/lose.