Definition of shark-fin:
(n) :
(ichthyology, countable) Any predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.
(n) :
(uncountable) Flesh of this animal, consumed as food.
(n) :
Someone who exploits others, for example by trickery, lies, usury, extortion.
(n) :
(UK, university slang, countable) A university student who is not a fresher that has engaged in sexual activity with a fresher; usually habitually and with multiple people.
(v) :
(transitive) To engage in sexual activity with a fresher.
(v) :
(intransitive) To cruise for casual sex with a fresher at a bar or club.