noun

• (uncountable) Something disgusting.
  "I fetched an orange from a basket and peeled it […] “Make sure you peel as much of the yuck off as possible,” she said. “I hate the yuck.""
• (derogatory, informal) A general insult.
  "Alright, settle down, you yucks!"

verb

• (euphemistic) fuck.
  "I can see these pro-lifer's screams of “Stop killing the foetus” turn to “I ain't taking no mother yucking nickker home to my mother yucking house.""

verb

• (often followed by "up") To laugh or joke.
  "And I so miss the laughs we yucked when I used to point out to you the irony of people's names in town ."

noun

• (US, military, slang) Synonym of yearling (“a sophomore at West Point military academy”).
  "Amy tells us that her husband, Jim Nelson, is deployed to Afghanistan […] as a nuclear operations officer — a result of graduating from the Naval Postgraduate School in December 2007 with a master's in Applied Physics. I guess I should have been looking for Jim to partner up with for physics help as a Yuck!"