noun

• (colloquial, derogatory, US) A jerk; a person who is unlikable, detestable, or contemptible because he or she is stupid, foolish, clumsy, oafish, inept, malicious, or unpleasant.
  "One day my girlfriend, her boyfriend and I were sunbathing topless because that's Barbados - you can wear nothing if you want. And the Pepsi guy walks up and with my agent to meet us for lunch. I wondered if I should put on my top because I have a business relationship with him. I didn't want him to get offended because the rest of the beach had seen me with my top off. Meanwhile, as he's walking towards me he's saying to my agent "I hope she puts on her top.". He wasn't even being a schmuck, like wanting to see."
• (colloquial, derogatory) A deplorable, pitiful person.
  "poor schmuck"

verb

• (slang, intransitive, rare) To behave like a schmuck.
  "[…] there's actually a shortage of schmucks in America. As a result, there's big money in schmucking. The average schmuck earns $28,000 a year, plus benefits."
• (slang, transitive, rare) To mash or smoosh.
  "His buddy was supposed to be arriving from Helena that morning but had schmucked a mule deer buck with his vehicle so there was going to be a delay."