noun

• (informal) hepatitis.

noun

• (obsolete) A hip of a rose; a rosehip.

adj

• (dated slang) Aware, up-to-date.
  "I was pleased, as I put him hep on the Wilbert-Phyllis situation and revealed the part he was expected to play in it, to note that he showed no signs of being about to issue the presidential veto."
• (dated slang) Cool, hip, sophisticated.
  "And I was struck to notice that though the band was only Jumble imitation of our style, it was quite a hep combination, with some feel of the beat, not like those dreadful records of the English bands I'd heard back home which never can play slow, and never can play easy to the limbs."

verb

• (dated, US slang) To make aware of.
  "I hepped him to the situation."