A thick whitish fluid containing spermatozoa that is ejaculated from the male genital tract. Also known as Semen or Sperm. Unlike semen, spunk can also be used as a verb.
'A thing of' is a very Irish way of describing an inanimate object, usually a container or packaging of sorts. Be it down to laziness, or actually not knowing the name of what the object is, this expression has many uses.